Revshare any day, in casinos. Just one whale can be worth hundreds of CPA players.
In bingo I like a combination, since players often take a long time to convert.
Poker sites that also offer rake back are better done on CPA since you are very likely to lose your player soon if you don’t also offer rakeback.
If the rakeback trend continues the way it is going now, Poker may well be best kept at CPA only.