I have both:
AVLE: No doubt more challenging, and for me, because of the harder shots it made me a better player, but can also certainly be frustrating. Not as relaxing for casual play. Beautiful light show and better graphics than the TF. DMD modes are easier on the eyes, and far more interesting.
TFLE: More fun and relaxing to play. Easier shots, and longer ball times. Decepticon cannon is a thrill I have not tired of. DMD movie clips hard to see. Artwork on playfield not as crisp. Easy rule set to follow. More toys on playfield make it look like it's worth more.
If you have young players they will play TFLE more.
Bottom line: For entertaining (or kids), TFLE. For you, AVLE.