Before choosing a slot, it is worth understanding two things clearly — volatility and RTP (Return to Player).
Volatility tells you how often wins come and how large they tend to be. Low-volatility games give smaller wins more often — good for stretching a budget over a longer session. High-volatility games can deliver bigger wins, but the wait may be longer.
RTP is the percentage a game theoretically returns over the long term. For example, Fortune Mouse has a maximum RTP of 96.96%, and Mahjong Ways 2 has a maximum RTP of 96.95%. These figures are averages across millions of spins, so results in any individual session will vary.
The sensible approach is: if your budget is limited, choose a low-volatility game; if you are willing to take more risk for a bigger win, choose a high-volatility game and size your bets accordingly. tk 4444's responsible gaming guidelines can help you set your own limits.