Points taken, but subjectively, I've played all three outfield positions for a long time, and center is the easiest in getting good jumps for the reasons I listed.
Generally, fly balls hit right at you aren't as hard as line drives hit right at you, especially rising liners, but that holds true anywhere in the pasture. The throw to third is tougher than from LF, but the longest, of course, is RF.
For me. right field is definitely the hardest -- or most unfun -- because of the longer throws, and mainly the opposite curves off barrels of right-handed batters (which are the majority of hitters).
Center field is also a blast because you get more chances at making diving or sliding catches, since there is always a corner outfielder backing you up; not so much for them, though, on shots down the lines...