I guess the PAL came first? Judging by looks I find myself going back and forth, the L7 does stand out a bit more from what I'd expect a razor to look like (which I kind of like). I read about the twin blades but not really sure what the benefits are, or where to find them?Beyond the fact that all injectors have similar-looking heads, the two razors are quite different. They are made by two different companies more than ten years apart The Injecto-matic was made by PAL and the Championship (L7) was made by Schick as a commemorative of the Olympic games. The Injecto-matic is a little more agressive, has a tighter head, so it can't take the twin blades, and has a completely different handle. I prefer the Injecto-matic because it gives me a little closer shave. To me, it resembles a Schick Type G in it's shaving feel.
My recommendation would be to get both.
Getting both is not an option at the moment, but I admit it's tempting!