Re: Slots 101: Basics, Strategies, and Discussion (with poll)
Do both is better, I mean combination between normal spins and buy feature. What I used to do first is buy 1-2 free spins and look at the result, if the result is bad then I'll try 100-200 spins. If I get no fs in that 200 spins, I'll back to buy 2-3 free spins. If the result is still bad, it means I have to change to game. 
Obviously, it is preferences but I'm not recommending anyone to do too many buy bonus in a row.
That's not a good test though, I mean you could be lucky in free spins but not when you buy more spins and vice versa but that one is hard to prove since they might not move to that point because they start at an unlucky streak. You might find some slots that bait you into playing more by letting win consecutive times at a lower prize money and then when you move to higher prizes then that's when they start taking profit. Just be careful playing slots as that is the game that favors the house more. Obviously, it is preferences but I'm not recommending anyone to do too many buy bonus in a row.