Between the Rats and the Basics I feel as though you will not go wrong either way. I like the Basics mainly because I have become so attached to them through time and use. Much like my old Browning A-5; there may be better and more advanced shotguns, but I'll grab the Browning more times than not.
As for the Rats. I like the handles better than the Basics in both shape and composition. I do not have first hand experience in testing the difference between the M-INFI and the SR-101, but the Basics have served me well throughout serious use and the Rats seem very tough as well. I personally chopped a cement block at the last BLADE show with a Rat and the edge held up great. Flip a coin; you will not go wrong either way.