Neither is my vote

I owned a TFLE and played a lot of Avengers both pro and LE.
Both Gomez designs and have similar problems

Here's my beef with the two games
1.) Lots of little design flaws out of the box (some fixable some not)
2.) Software is very repetitive, more so on TF
Tf shoot four shots and start mode
All the modes are really similar in play as well despite the characters being very different.
Example; Shockwave could be a rumble mode but instead it's shoot orange triangle like all the other modes.
Avengers
Shoot shots to start hero mode
Play hero mode and sometimes enter battle
While the code is better than TF it's still not great.
Long ball times with not enough variance in rules is probably why I don't care for either.
3.)Toys
Nothing special

Granted I understand people have different taste but neither game did much for me. I only bought TFLE cause it was cheap and I felt breaking even or a very small loss would be easy. Had it six months then broke even.
TF is my girlfriends favorite though she doesn't play too much. She really liked hitting Optimus prime in the nuts.

If you can get them for a good price then by all means play them and have fun. Prices are pretty affordable on either and they're newer sterns so it's not like you'll be able to beat either in a week.

Some folks love these game
I'm happy to have owned TF and broke even in the end, but I wouldn't buy another even if it was cheaper than the previous one I had.