The biggest reason that AO2 and TWT2 feel and look different in a match is because of the aiming differences. Aiming: AO2 and Matchpoint feature pinpoint aiming TWT2 does not.
The biggest differences in terms of groundstroke gameplay (all observations based on default difficulty levels): AO2 is ultimately more fun to play than TWT2, despite its sub-par player-movement mechanic, which can make your player feel like they're moving in sand.
Long story short: I think TWT2 is the most visually appealing game of the three, but it has a very difficult learning curve. Put way too much time in it, and now figure I'll share here. I wrote this in response to someone asking me to compare these three games.