I have less real insight than some here. I'll just say that I went to try DI, was great but elected to buy WoZ instead. I do love WoZ tremendously and feel like DI is a great pin as well, but it didn't grab me, maybe it was the moving electric guy it was great but I wasn't blown away by DI.
I did order TNA #155(?) because I like the way it looks, the retro theme and fast gameplay and simple yet challenging rules, the music and the ambiance. I was going to say the build duality and light show but DI has that as well. But TNA is a bit cheaper so on balance and will sell in lower numbers if that's worth anything. Have not played TNA yet.
My collection has nothing quite like TNA so that was the main draw, but the other aspects (music, lighting, retro vibe etc..) all played into my decision.
But likely they are both fantastic so it's not like you are picking between a good and a bad game.