Whoops, sorry about that shigawire4sure, didn't mean to hi-jack your thread.
Seriously, as far as SR-101 goes, they use to play a really cool testing video at the shows and SR-101 is unbelievable at its price point. Heck, at any price point. Chopping through cinder blocks, bending in a vice and snapping back to true, sticking a Battle Rat in the receiver hitch of a pickup with an engine block in the bed and jacking it up without a problem.
The edge performance is very similar to INFI as well. It will tend to roll or dent but not chip under heavy impact with harder objects. It easily takes a keen edge and holds it very well. It's easy to bring back to sharp.
As stated, INFI's higher resistance to corrosion is a plus. However, when SR-101 begins to rust, it is a very light surface rust that is easily rubbed out. And, even with satin blades that are used often and have a minimum amount of maintenance at the end of the day, I've never had a problem with rust.
One interesting thing about the larger old school Rats is their differential temper. The edge was brought to high hardness but the spine was drawn down a bit making it softer in order to more closely match the lateral performance of INFI. Of course, INFI is through hardened, yet remains incredibly strong. Newer rats have reportedly been trough hardened as well, but I doubt any of us will ever tell the difference in real world use. And I think that's the key. The things that you and I will experience as users is the performance of the edge during heavy impact, ease of sharpening and edge retention more than anything else. To get any of these knives to bend so far as to damage them will generally take a helper bar to get enough leverage and at this point, we are way beyond normal knife use.
INFI is superior to the other two overall, but I think there is a point of diminishing returns in blade steels. If you want the best, get INFI. If you want the best performance per dollar, go with SR101 and if you want fantastic performance at an unbelievable price, SY is where it's at.
Now, let's go chop something!