I'm assuming that you're planning on solo or with a singer/instrumentalist. Both of these keyboards are arranger keyboards, which means they're replacing the drummer/tabla players. If you're planning on a bigger band, you'll need to get drummers/tabla players who are willing to follow a machine's tempo. They're not impossible to find, but most drummers think they're better at setting and keeping tempos than a "stupid machine".
Looking at the specs of the two keyboards, it looks like the Roland is better, with double the polyphony. Polyphony matters more for an arranger keyboard than a normal keyboard because so much is being driven by the keyboard's computer rather than your fingers.
On the other hand, the Yamaha has more styles onboard, and you can keep adding styles from their website. I'm not sure how much support Roland has for arrangers; the two names I always here are Yamaha and Korg.
Do remember to include in your budget money for an amplifier. The onboard speakers are probably fine for playing and practicing at home. However, once you're playing in front of a bunch of people, you'll probably want more clean volume than the tiny speakers can provide.
The most important factor is the one I can't speak to. While I enjoy Indian music, I can't speak to which of the two keyboards produces better, more realistic sounds and styles. See if you can find them in stores where you can hear what they sound like. And if they're not available in stores, check out the instruments on YouTube. Try to imagine which one will best represent what you're trying to create. You don't want to play some sort of cheezy American version of Indian music in front of an Indian audience. (Or a knowledgeable American audience; we're not all cultural idiots.)
Best of luck with your decision.
