I have the TnT Rex and I don't regret getting it. That said, I have a feeling that I'll like the EC Rex more just for the posing options whereas TnT always defaults back to a straightened pose even with the dynamic puppet feature. It's definitely meant for that pickup-and-play factor which is fun but useless if you don't care for action features and sounds.
I see myself displaying it and only occasionally playing with it, but the EC Rex will probably be the main Rex for my collection.>>6900664
While I'm not too keen on the battle damage paint, I'm tempted to get two of the EC Rex just to repaint one, so this might be ideal for me anyway. Plus that Monolophosaurs looks really nice.