My personal preference is Microgaming for their bonus feature slots ( especially Thunderstruck which I am addicted to 
Keno and 4 play power poker ( I have hit at least 6 royal flushes on the joker poker power poker )
RTG for their 100 hand poker , Tri Card Poker and all poker in general
Playtech for their slots ( they come second to Microgaming )
I can’t speak for the others as I haven’t played any others – tend to be a creature of habit and live at Cyber Piggs Peak SA
PS Don’t worry about the champagne – It will cost too much to ship it to South Africa;)