The first link
Ahhhhhhh . . . those are lovely stones ! ! !
Truly great, flat, long lasting, consistent grit sizes, very useful for flattening water stones because of the dimples in the surfaces where there are no diamonds.
Totally worth getting.
However . . .
not really for pocket knives. Why :
The dimples catch on the tips of small knives there fore you are better off with flat SMALL stones with no dimples see my comments bellow.
The second link
Yes that is a little more like it. I have those as well. Mine are the ten inch but narrower than the DMT stones in the first link. I found the grit to be more lumpy and less consistent but with LOTS of use they broke in to a nice useful surface.
You should be very happy with those for pocket knives, fixed blade belt knives and all but the largest kitchen knives. Mine have clear rubber feet on the bottom of each stone (keep in mind they are single sided in my experience). They are quite heavy if you are planing on carrying them on trips in your luggage you may prefer the much lighter but still very flat and durable dimpled ones from your first post or see my comments bellow.
The third link
Yes this is closer to what I use for my pocket knives and touching up tools at work (see my comments bellow).
The advantage of this set is you have more knuckle clearance off the table surface while sharpening. I still have the stone right near the edge of a counter or you can use a sink bridge or you can hold the stone in your hand and the knife in the other (see my comments bellow(I bet you are getting tired of reading those words by now))
Disadvantages are the danged dimples and they are not compact for taking with you on trips in fact since they are thick and not double sided they will take up considerable room.
All good choices, can’t go wrong. Buy what you fancy. I have all three to one degree or another.
I was pursuing an impossible dream and just kept buying stuff and throwing it at my problem until I learned better. You won’t have that prob unless you are a hand tool woodworker in that case talk to me about that one.
I want the stones to last at least a year with sharpening a knife 2-3 times a month.
ha, ha I am suppressing a smile here.
Chances are these high quality diamond plates, any of the ones you posted links to, will last the rest of your life. No prob.
So . . . what is all this business of "(see my comments bellow)"?
More and more . . . for hand sharpening smaller pocket knives . . . I use very small stones on the order of three inches long and an inch wide and hand hold the stone in one hand and the knife in the other. I set up a light very close to the edge, a foot away, or sharpen outside in bright sun so I can see the bur and the glint from a dull or dinged edge. I wear a fairly high power jeweler’s visor so I can see what effect I am having.
The more I sharpen the more I am reminded . . . once an edge is the right geometry and has no serious chips or dings . . . bringing an edge back from barely cuts and won’t shave to holy moly that’s sharp and whittles hairs takes VERY FEW . . . SHORT strokes.
For reprofiling and kitchen knives get the big O stones.
For everyday touch up I use these (see link bellow) or merely a Spyderco Ultra Fine ceramic rod and or a little chunk (three inch by one inch) of 8000 Norton water stone and or a little chunk of 4000 Norton water stone if I need to really move some metal.
Mostly you will want the finer stones like these or I also use the two finest stones from the DMT aligner kit but it has those danged round dimples and is not the best held free hand on small knives because the tip catches in the dimples. I find the Aligner isn't much use on small pocket knives; better for large ones. The DMT Aligner optional 8000 diamond stone is lovely and fine though and I use it on my S110V for touch up. The EZ lap paddles don’t go that fine.
The EZ lap paddles are so portable I have them in my back pack every day for use at work. Can even sharpen cobalt drill bits with them (don’t breath the dust).
https://www.amazon.com/gp/product/B002RL83DQ/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
