I definitely prefer the depth of rules LOTR has to offer, and while I can't willingly criticize TAF for having a relatively shallow ruleset (as it is a product of the time it was built it), I'd still prefer TAF, as I like the humor and it's timeless nature.
Granted, if LOTR was thematically different, I'd go for that. I'm partial to game theme for sure.
Now, stepping back and looking at each game objectively, and considering you've owned TAF in the past, I would choose LOTR for sure.