Consider using a machine with a higher volatility if you're looking for a sizable win. Nonetheless, a machine with reduced volatility is a better option if you would ratheracrade win more frequently. Because different players have different tastes, the theme and design of the slot machine may also affect your choice. Bonus Features and Return to Player (RTP). Another crucial factor to take into account is the return to player (RTP) percentage, which shows the average amount of money given back to players over time.