What's your favorite software provider for slot games?
Personally Netent.
Edit: Mods can you move this to discussion, sorry.
For me the best slots providers is microgaming. I like it because it is the only providers that lets me to play with low bet amount per spins. This provider also has so many slots games, even though most of them are similar in terms of the payout but it is good because get more options to play.
Microgaming also offers nice amount of jackpot especially on the Mega Moolah slot. The most important thing, I have not heard any issues on payment from this provider.