I have all three and I like the Swisstool the best. The Swisstool is a heavy duty tool and has the easiest access to all the tools, without clumping or having to fold and unfold the handles. All of the Swisstools tools lock and they are safer and easier to unlock than the Supertool. The Swisstool also has a straight edge on the rulers/handles and a nice wood chisel.
The disadvantages of the Swisstool are the screwdrivers and to some the pliers which are sort of a cross between needle nose and standard pliers. The Swisstool, like the Supertool is one of the biggest and heaviest mulitools.
The Supertool 200 is also a heavy duty mutitool, which has the advantage of true needle nose pliers. If you use the pliers a lot but dont use the tools in the handles much the Supertool 200 is a very good choice. The Supertools tools are inconvenient to get to since you have to unfold the handles, find the tool you want, separate it from the clump of tools, lock it into place and refold the handle. And when you want to close the tool, you have to release the lock using the lock levers or by unfolding the other tools in the handle, and then folding the tool(s) closed and then folding the handles. With the Swisstool, you just unfold the tools from the outside of the handles (with no clumping) and lock the tool into place. The Swisstools lock release is also much easier to use.
Despite the Supertool 200s hard to access tools, it is well made, comfortable to use (unlike the earlier original pre 200 Supertool) and has a very nice electrical crimper and lanyard ring.
The Wave has the advantage of one hand opening knife blades along with a little less weight and bulk. The Wave has the same scissors and Diamond file as the PST II. You can get the Wave with either a nylon or leather sheath (I like the nylon one better, but the leather one is also very nice). On the downside, aside from the knife blades, file and saw, the Waves tools do not lock. The Wave also lacks rulers and an awl.
If you decide to get a Wave, I would suggest buying one locally so that you can check out the operation of the pliers and the knife blades I have seen some with blades that were too tight or with handles that wiggled.
- Frank