Whales have individual tastes just like everyone else. I don’t think it’s so much what software they like, it’s whether your site tells them what they want to know. I have some whales that come back to me to look for new places to play and switch around, for them it’s most important to find lots of info and it must be fresh.
I don’t just want to attract a whale once, I want him to come back to me after he is done with where he was playing. Whales get sick of losing like everyone else, and smart whales who play what they can afford and keep playing indefinitely are the kind I like.