I much prefer the ruleless approach of TTS to be honest. It gives you that tactile sense of actually moving pieces around the board and interpreting the rules yourself that makes a board game feel like a board game. But with undo and instant setup and without the requirement that everyone be in the same place.
Not that it's a great tabletop game, but have you ever played a PC version of Monopoly? It's the most boring way to play an already incredibly boring game.
My only issue with Tabletop is that all the games I want to play with friends (and that at least one of us owns physically) keep getting DMCAed. That's fine in and of itself, but if a company is going to stop people who own their game from "pirating" it, it'd be nice if they'd make it available legitimately as DLC.
It's nice to relax and have the engine take care of it, and by pushing things you can actually learn odd interactions you wouldn't have discovered through reading the rule-book.
I also love the idea that it will resolve things correctly right away instead of having to look at the rulebook every time you run into some crazy edge case or wording confusion.
boardgamearena has the advantage of actually having rules engines so you can also relax more while playing knowing the engine is taking care of the rules freeing you up to making tactical mistakes instead of rule mistakes.