1. What volatility suits your budget?
Volatility describes how a game distributes its payouts over time. Low-volatility slots pay small amounts often, which stretches a modest balance across a long session. High-volatility slots pay rarely but much larger, which means extended dry runs that can drain a bankroll quickly if your stake is set too high.
If your session budget is small, low volatility is almost always the better fit. It is not about which game "pays more" — over the long run RTP governs that — it is about how long you stay in the game before variance decides the session for you.
Low — frequent small winsHigh — rare big wins