Rush generally plays worse than Zoom; more bad players.
But either is not good for beginners, imo. So many traits of the bad players are not obvious when you keep changing tables, and the bad players are where you will make most of your money, so trying to build a bankroll there will be more difficult than regular cash tables.
Does the player
bluff constantly? Do they overvalue top pair/weak kicker? Does a min bet on the flop mean they're trying to get you to raise/keep going, or is it a test and they will bet larger as it goes? Are they calling down with an underpair, or slow rolling a set?
Those are the kinds of things you can see at a regular table that you can't see at Rush/Zoom/Fast Forward. Even with a HUD, you have to guess much more than you would at a regular table, so I don't recommend it for beginners.