Which Game Do You Feel Gives You The Best Odds / Best Scatters?

Personally I am playing to get reward points to work towards Platinum status. I save my coins until a double or triple XP day then blow them all. With so many games available, I was wondering which games others find to give them the best odds, bonuses or scatters. -- I've done pretty well with Mammoth Mula - but haven't tried many others. Thought answers might help alot of players.