I guess it just depends on which your favorite suit is, and if you're prepared to futz with it. Out of the box, I'd say the HT Quarter Scale wins, from what I've seen. It's got pretty much every accessory you can imagine, and, with the exception of the cape, it's about as good as it gets for an official release. The EB comes with pretty much everything it'd need to adequately represent its portrayal, as well, but it's got some issues, as well. The belt needs to be modded, as far as I know, in order for it to sit right. Otherwise, he kind of resembles Urkel, for lack of a better comparison.
Either way, they're both pretty definitive interpretations of their respective suits, so, do you like the TDK suit or the Begins suit better?