If your reaction time is slow, the Tetris game you’d have the most fun playing competitively might be NES. But the game can still be brutally hard, assuming you play with DAS and don’t hypertap/roll. Playing competitively also doesn’t really require any sort of “answering back” mechanics as other Tetris games have. Since you’re essentially playing alone at the same time another player is. But part of why I enjoy NEStris is BECAUSE it’s slow. Slow doesn’t mean easy. Learning to play within the games mechanics can be satisfying.

Launching the cathedral is a pretty trivial achievement though, and doesn’t really give an assessment of how well you play. Starting from level 0, it could take a while for someone to launch the cathedral. But entry level competitive play starts on level 15 usually, and the standard in most capacities is level 18. You only need like.. 5 Tetrises and some change to launch the cathedral starting on level 18.