Here's my take. Slots made before 2007-8 probably had payouts set 90-94%. Many of those older slots still around are Aristocrat. Most of the old titles, it's safe to say, have never had any software updates pushed through to lower the payback. Nowadays, you can figure around 86% payback on new machines, but the minimum in NV can drop to 75%.

Also at play is volatility. Overall, many if the older slots had somewhat lower volatility than the new ones. That shiny new slot that advertises a $15K progressive scoops that money up from somewhere. Are there exceptions to the volatility on new games, sure there is. Some of the new IGT slots pay $10 for a full screen lol.

Combine the higher payback with a little less volatility and, to me, they are much more playable for someone who will sit all day playing slots at $1 or less. I've had waaay too many experiences of these newer slots eating $100 without batting an eye. The older slots, that's a much rarer occurrence. You will notice a difference between a 92% and an 86% payback at the end of the day. In short, I trust the older Aristo.

Our last trip to Vegas, I played only Aristo for 4 days with a short session on a WMS. Coincidently, I came home slightly ahead on the slots. First time in years.