I don’t like any Crisis I’ve read, as they all involve too many characters that I just couldn’t care less about. On a conceptual “this could make for a brilliant movie/show if it were streamlined with fewer characters” level, Final Crisis easily takes the cake for me. I just love the premise and ideas behind that one so much. Execution is where it got messy and totally lost me at times because again, just too many characters to have to know and care about. If I were to want to see any Crisis adapted for the screen, it would be this one, as long as it were streamlined and molded into something more accessible.
On a “well at least this was an enjoyable read” level, I’d go with Infinite Crisis. I am not a Geoff Johns fan, and as with most of Johns’ writing, I found this basic and unremarkable, but enjoyable all the same. This was probably the most simplistic Crisis, and when it comes to Crises, that just makes for a better read for me.