15|10 is better for progress.
The increment gives time to win a won position or draw a drawn position.
The longer duration also allows deeper thought.
Above 2000 it becomes harder to get paired.
15 | 10 vs 10 - 0 reaching 2000 on chess.com (rapid)

Hey Sundip, I recommend playing both 15/10 and 10/00.... Tygxc is right, with 15/10 you have more time to think and everyone's chess performance is higher. Still, I find that a lot of people are in "blitz" mode when they play with these time control and don't take advantage of the extra time and increment.
10/00 has it's own advantages. For example, if you only play 15/10 you will eventually be paired with same players over and over again. 10/00 seems to expose you to many other players you otherwise would never see. Also, 10/00 is more compact and you know that the game will last 20 minutes max. That's important if you have a busy life at home or if you are on a lunch break at work, etc.
Cheers
Has anyone made it to 2000 chess.com rapid playing exclusively 15 | 10 or should one focus on 10 minute with no increment? Keen to hear perspectives.