I had 920x on Berryburst max, 10p stake, because i had 3 euro from free spin wins to waste on something. I usually play Novomatics and Merkur slots at 20-25p stake, since they can be so brutal, but still pay really well. Same with Jammin Jars, it’s dead most of the time, so 20p is usually what i have to do if i want any sort of decent playtime.
You can do 10p on Dunderbust (thunderkick) slots, but the chances of winning big on those is really small.
Bonanza, Diamond Mine, Irish Riches, Extra Chilli and Buffalo Rising are usually a bit safer to play a slightly higher stake on, since they usually give you a longer playtime. Genie Jacpots is brutal, even at 20p.
Definetly don’t play Finn and the swirly dead spins.