yeah, I went on a psychotic tear - pre-Crystal Skull panning, even! - about how this is the real Indy 4.
One of the best damn adventure games ever made, all three paths are fun - though "Team" is probably the most canonical, "Wits" has some fun alternative puzzles and challenges. "Fists" is slightly skimpy in parts. One thing I really liked was how the same puzzles had different solutions depending on what path you were on - in one path, you might talk somebody out of an item you need; in another, you might punch them the hell out; in the third, you might create a diversion to scare them into running away, leaving the item behind. The mixture of old-and-new content in each path was pretty great.
I was never able to find it for FM Towns while I was in Japan ;_; (I own the FM Towns Indy 3, though)