bustabit... has half as many crashes
This is completely false. I've run multiple comparisons between the two (I actively play on both sites) and have found them to be equal. I don't get where these claims are coming from. The only difference is that with BAB there is a higher player pool, so the bonuses are bigger (note: bonuses are what push you over the house edge into +ev). Past that, both have been working the same as far as I can tell.
On TTM, the chance for instant crash (crashpoint = 0) is 1 in 67 (reference:
https://github.com/TwinWinNerD/bustabit-gameserver/blob/master/server/lib.js#L146-L157), while on BAB, the chance is 1 in 101 (reference:
https://github.com/moneypot/bustabit-gameserver/blob/master/server/lib.js#L73-L84).
As a result, TTM's house edge is roughly 0.5% more.
On the other hand, TTM offers a weekly rakeback to the biggest players and offers an opportunity for investment.