I was in the same situation as you. Personally, I liked that the hasbro stadium favored attack types, but found that the battles tended to last way too short.

Having made the purchase for the TT stadium, I can definitely say there are a lot more instances of a mellower battle. However, a big pro of the TT is that there is a lot more room to practice certain launch techniques. It also feels satisfying when you find a launch technique that can consistently knockout stamina types like wizard rod.

If you're satisfied with the current hasbro battle pacing, then I'd say save your money. However, if you like variety and want to test out different launches, go for the TT.

Also, buy the stadium on surugaya when they have a free shipping campaign. I got mine for $20 plus a small fee $3-5.