I am deciding between an RC-3 (Sorry For the confusion) and a Falkniven F1 any suggestions on why one or the other is a better choice.
I've never owned an RC3 and my F1 is gone so I'm not best placed to judge, but I'll give you my brain dump anyway-
There are only two reasons why I let the F1 go. By far the biggest was that I prefer the kind of companion style[ish] handles like Brian Goode uses on his Companions and Sidekicks and that Nick [NWA] uses. If it weren't for that I would have kept it. Much less of a factor, but still something I enjoy, is a blade with a bit of taper. In sum, if Fällkniven had designed the F1 with a handle shape like the Goode / NWA it would probably have been years before I considered migrating to a different design.
Now to the speculative bit:
The RC3 is a neat design but the F1 is made from far more progressive and user friendly materials.
Siguy said, i have heard alot that the F1 handle is too small. Mmm, I can't skate with that. I'm quite big and I didn't find that to be the case. I think there may be a difference between having big hands and having fat hands with sausage mitten fingers lacking in dexterity though. Still, if you've got those kinds of hands that would find the F1 handle too small the RC3 is going to come in at jockey size.
Both have exposed tangs for beating on things, but here lay a distinct division. The end of the F1 is kind of flat, so you could use it for driving in pegs and pins. By contrast the RC3 terminates at pointy skullcrusher type end. While that gives the RC3 an urban advantage as a Millwall Brick or window breaker its advantage in the field is not obvious to me.
If you loath painted knives you'll also find a difference. Strip the coating from the F1 and if anything you'll likely make no difference in perceived performance. Do the same to an RC3 and you've opened up the maintenance floodgates.
If you go the route of the synthetic sheath there are clear differences. I've only really heard groans about the F1 one. No surprise, it is a basic factory molding. But hey, once we get past the old scarcity principle that if it is harder to get or cost more it must be better we can judge it more reasonably. The scarcity principle often gets rubber handled tools marked down because it is an easy cheap bit of molding, but we can often see from screwdrivers, pliers, garden tools, and knives etc. that it often actually works better. Same with the simple F1 Zytel sheath. It is very compact compared to other designs. It worked great for me dangling on either a baldric or a merc rig. And for extra bonus points makes a package that fitted in any one of at least four of my pockets on any one day. By contrast the RC3's sheath is clearly better made, and there's more going on with it. If both sheaths cost the same you'd feel cheated by the F1's. However, the RC3 sheath is more suited to belt, webbing, or pack attachment. If you want a discreet pocket carry or a dangler the F1's wins.
Last there's also the sexiness factor of micarta, and comparing the RC3's micarta over the ugly functional rubber of the F1. Well, kinda. If I had an RC3 no doubt I would polish it up to high shine and work the handle some, and I think it could look quite pretty. Yet I still don't think it could compete against even a stock F1 micarta in the looks stakes, and as for the custom F1s done by Bark River, they are in another league.
Last, the biggest speculation about the RC3. I'd be really amazed if it held an edge better than the F1, but I've a hunch the RC3 could be tweaked to slightly edge it out in a pure slicing contest.
I think someone with an RC3 as well as an F1 is needed here. Meantime, I'll say that I don't think there are many knives out there better at what the F1 does, and if they are better in some way I'd be really careful about examining whether that better[ness] has any relevance or value to you.