Baeed on my experience.
BEST FREE SPINS
1. High Society - it is not easy to get them, but they can pay nicely. I always choose version with expandexd random wild reel. If yout get scatter, that reel also becomes wild, and two scatters retrigger free spins (and you hev 3 reels in wilds).
2. Gold Factory - this could go to no. 1, but the minumum bet is quite high (if you play with all lines). Very exciting and inovative bonus feature, I had no weak results (never less than 40x).
3. Retro reels extreme heat - not to difficult to reach free spins, they pey decent and if you strike $wilds in first reels it can go to 100x-200x. When you build up your balance, you can start calculating with respins, usually they pay or make you even or some plus, but also bad series can happen.
4. The finer reels of life - I guess many will be surprised, but when you get them they are usually nice. My preference is Wine and Cheese, Coffe and Chocolate and then Whiskey&cigars. Champagne are very much like Micheal in Immortal Romance, I don't like rolling reels.
5. Centre Court - also quite hard to get, but can surprise you with wilds and multipliers, at least you can return what you invested until the free spins.
It reminds to Avaloin (I.).
WORST FREE SPINS
1. Alaskan Fishing - to me free spins are pointless, I can't remember when I had 5OK and I can only dream about all that stacked wilds. Multiplier is poor, very difficult to reach free spins (and two scatters pay nothing). Horrible.
2. Twisted Circus - very hard to get them and when they come, they pay nothing in 9/10. I don't understand it, it is pure cheat. I also could put it at first place, but once I did get 5 wilds and nice ~530x bet (and it was only winning spin of all 13). I would be happier if they at least triple bonus when you hit it.
Is it compensation for big wins potential and rather frequent bonuses in base game, I don't know.
3. Break da Bank Again - I don't care how ultro-high-variance is the slot, but free spins should be reward and very often they are able to give - nothing.
And they are certanly not that often.
4. Hot ink - although has respin like Retro reels there is dangerous to use since free spins are very stingy.
5. Immortal Romance - what I said for BDBA, it can go here as well. Shamefull that such demanding slot can let you so much down. But theN, at least this slot has Wild Desire and free spins are more often then in the slots sbove.
As a final word: it doesn't mean that first 5 can't let you down and next 5 to give super-mega-big-win, but this is some average evaluation.
I think that high variance slots (if not all) should have some win guarantee, at least 15x (20x should be decent).
BEST FREE SPINS
1. High Society - it is not easy to get them, but they can pay nicely. I always choose version with expandexd random wild reel. If yout get scatter, that reel also becomes wild, and two scatters retrigger free spins (and you hev 3 reels in wilds).
2. Gold Factory - this could go to no. 1, but the minumum bet is quite high (if you play with all lines). Very exciting and inovative bonus feature, I had no weak results (never less than 40x).
3. Retro reels extreme heat - not to difficult to reach free spins, they pey decent and if you strike $wilds in first reels it can go to 100x-200x. When you build up your balance, you can start calculating with respins, usually they pay or make you even or some plus, but also bad series can happen.
4. The finer reels of life - I guess many will be surprised, but when you get them they are usually nice. My preference is Wine and Cheese, Coffe and Chocolate and then Whiskey&cigars. Champagne are very much like Micheal in Immortal Romance, I don't like rolling reels.
5. Centre Court - also quite hard to get, but can surprise you with wilds and multipliers, at least you can return what you invested until the free spins.
It reminds to Avaloin (I.).
WORST FREE SPINS
1. Alaskan Fishing - to me free spins are pointless, I can't remember when I had 5OK and I can only dream about all that stacked wilds. Multiplier is poor, very difficult to reach free spins (and two scatters pay nothing). Horrible.
2. Twisted Circus - very hard to get them and when they come, they pay nothing in 9/10. I don't understand it, it is pure cheat. I also could put it at first place, but once I did get 5 wilds and nice ~530x bet (and it was only winning spin of all 13). I would be happier if they at least triple bonus when you hit it.
Is it compensation for big wins potential and rather frequent bonuses in base game, I don't know.
3. Break da Bank Again - I don't care how ultro-high-variance is the slot, but free spins should be reward and very often they are able to give - nothing.
And they are certanly not that often.
4. Hot ink - although has respin like Retro reels there is dangerous to use since free spins are very stingy.
5. Immortal Romance - what I said for BDBA, it can go here as well. Shamefull that such demanding slot can let you so much down. But theN, at least this slot has Wild Desire and free spins are more often then in the slots sbove.
As a final word: it doesn't mean that first 5 can't let you down and next 5 to give super-mega-big-win, but this is some average evaluation.
I think that high variance slots (if not all) should have some win guarantee, at least 15x (20x should be decent).