The longer the time control, the better play. What works in bullet no longer works in blitz, what works in blitz no longer works in rapid. Bullet is a matter of dexterity, moving fast, premoving, flagging. Blitz is in between. Rapid comes closer to real, classical time control chess.
For all rated below 2000 recommended is 15|10 rapid.
Difference between Rapid, Bullet and Blitz ?
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What are the key differences between rapid, bullet and blitz chess, and how should one adapt their play style accordingly?