Go for the RAT heres why.
1) great fit and finish its about as good as it gets in this department.
2) durable coatings that take awhile to rub off (at which point you probably will have a patina starting anyways)
3) Rat has about the best heat treat for 1095 on the market ive yet to see a company that can top rats rowen heat treated 1095
4) 1095 is very tough and even though it isnt a super new high speed stainless steel it has been being used as a knife steel for a long time and performs quite admirably if your going to be using you knife why would you care if there is discoloration? its gonna get scratched scuffed dinged and nicked anyways.
5) Visual appeal, i think all the rats are handsome knives oarticurarily those with the green liners they add a slight visual flair to a tool meant for use.
6) great linen/canvas micarta handles that fit the hand well and will hold up to most any use.
7)Warranty this is a really big one for some people. if you break your rat no matter how then you can send it in for a new one.
8) the rat sheaths are all very well though out and lend themselves to carry in most any way that you would want to carry, also KSF has very nice weatherproofed leather sheaths for sale that are amazingly rugged and quite handsome to boot
9) Rat knives have excellent and well thought out designs that are the product of lots of field use by outdoors professionals the full flat grinds keep the knife slicing like a champ even at 3/16 inch thick.
10) if you a guy that wants serrations rats serrations are more easily sharpened than other types of serrations and work just as effectivley.
11) When you buy a RAT knife your supported a great company run by great people who actually care about their customers.
If that doesnt sell you i dont know what will
oh and heres the link for ksf:
http://www.knivesshipfree.com/RAT-Cutlery-1