In what market are you looking? Each country is different.
For the United States I have had great success with RTG brands. Namely affiliate edge and affactive.
Ace Revenue and Gwages all convert for me as well. I cant sell my players deckmedia brands no matter how hard I try.
I know Rev Jet pays, but they do not give me as big as a commission as the others so…
Betting Partners is great. They have Bovada which is very popular in the US. It retains player like super glue and Slots.lv is a decent mobile casino. They are the go to for BetSoft games.
For BetOnSoft slots and games I like my friends at Lotus Affiliates.
Wishing you luck!