If you really want an effective glass/window breaker, how about Victorinox Rescue? I think a dedicated heavy duty box cutter knife maybe your best bet? No need for sharpening and quite cheap to replace, that's a reason why many repairmen/contractors use them for work.
I am a gardener. And I have already too many things hanging from my belt. I am trying to find tools which I can use for more than one purpose. A rescue knife I can use it for many things. A cutter, for less things. Besides, Cutters do not last long in my job, they get full of ground, get rust, get stuck.
I do not like Victorinox Rescue

Actually I do not like Victorinox at all, but this comes from my experience with they red tools which many years ago had no locking system and I have cut my fingers badly in many occasions with blades which were closing while using them. And, I do not like the look of their tools, and the usability (dirty wet hands or gloves, with those "heavy metal guitarist's fingernails" kind of opening system... No, thanks).
I am trying to see if they make something I can like, because I saw a
video about how the pliers of Leatherman tools bend easily when you twist a nail (it is in German but you see the bending anyway), and another
video about how the wood/metal file is much better on the Victorinox. And the file is the main reason why I think to buy a Charge instead of a Skeletool CX. Well, ok, I also like the idea of having a second, serrated blade, and a cord cutter.
There are many ways to get a good edge. Really, if a dummy like me can learn how to do it, anyone can.
You do not know me. How do you know I am not dummyer?

Ok, I know you are right. I can learn.
But, I know I am me. I have many tools and few time to sharpen and derust and clean and oil them all regularly, and I am lazy.
I read that a s30v requires time and patience with a water stone, and loses its razor edge even faster when sharpened with a diamond stone.
Maybe the so called working edge is enough for my needs. But being a newbie I have no idea of what can one easily or less easily cut with a razor vs a working edge.
I read confusing things and start slowly understanding some.
For example I read that a polished edge is better for push cuts (like through wood) while a more toothy edge is better for cutting ropes, cardboard...
So, supposedly a s30v should be better than the 154cm for my use, having larger carbides.
And a diamond stone is exactly what i need.
Can anybody confirm or should I post this on another section of the forum to the sharpening experts?
I guess I should say that most knife window breakers are no more effective than a lot of other things you could use.
I'm sure you will figure something out, and then you'll find something else, and change your mind. Multi-tools are the kind of thing that can accumulate if you are not careful!
What about the video posted in the previous post? Of the guy testing rescue tools and proving that a steel glass breaker is not effective? Well, at least that one. Maybe there are other rescue tools with a very hard steel, which would work.
I stick with carbide, though

You are right about the serrated. Reason why I prefer the Charge over the Skeletool. Although then I think "ok, but I can take a skeletool and a rescue with serrated or combo.
I cannot collect multitools, no money for that. I spend already too much in garden tools

This is why I try to understand what to buy, before buying it.
But well, the pliers of the skeletool SEEM to be more sturdy than those thin ones of the charge. And the video about the not so good file makes me think "hmmm, maybe I should just buy a skeletool which has got all what I need often, and a separated GOOD file for when I need one. I do not really go camping or need to reduce space and weight on the backpack.
Serrated, well, as said, the skeletool costs the half. I should have money left for a mid class rescue knife.
(I am thinking loud, you can contradict me if you have a better idea)
I'm not sure why you're so hung up on the glass breaker.
If you want an everyday all-in-one multi tool with rescue tools, the Swisstool RS is probably the best fit.
I also do not know. I just think, if I buy the skeletool I miss serrated and cord cutter. The two things I get on a rescue knife, although I would not use THEM for rescue purpose.
On the other hand, once I have to buy a rescue knife I prefer it with a glass breaker, because most of them have it, and I prefer it being carbide.
Besides, yes, i have the recurrent open eye dream of saving a beautiful girl from some danger, and conquer her hearth (by carving her chest with the multitool).
The RS is discontinued, no more on Victorinox website.
Pity, it seemed to have almost all what I need, apart for the file.
But as said, at work I have gloves and often a bit (or a lot) wet, so that the victorinox could be more difficult to use than the Leatherman...
Ok. So.
Let's see what we have reached till now.
1) the skeletool has got all what i use the most
2) if I buy the skeletool I can buy a decent (rescue or not) knife with serrated or combo blade, and decide if and when carrying which or both.
3) the victorinox are difficult to use with dirty wet gloves
4) the charge has got less sturdy pliers than the skeletool (not sure about that)
5) the file on the charge is not really effective
6) I do not really need the other tools on the charge (saw: I have the silky. Can opener: I never eat canned food. Wire stripper: I can do that with pliers and/or knife, the FEW times I will ever have to do it. Little Philips: handy, but only had to use one once at home, where I now have a set of them. Scissors: I have many. Hook: yeah, I will need to buy a rescue knife if I really want a hook. Buying a charge over a skeletool just for a hook, hmmm.)
7) for my use (mostly cord and cardboards/thick-paper-bag, plastic) a slightly toothy edge is better. This can be achieved better on a s30v than on a 154cm, and with a diamond than with a water stone. IF all this is true, it is to verify if a 154cm sharpened with diamond stone would not be the most balanced solution of toothy-enough edge + easy sharpening + toughness vs hardness.
8) the pliers on the skeletool are sturdier (bend less when twisting stuff) than the charge's.
This said: what can you comment, confirm, add, contradict of these 8 statements?
Thanks again!