I think R15 is better ... I mean, 2 horsepower extra, also extra torque @ low revs ...
You'll regret taking R125 for India, reasons:--->
1. Get 95 octane Fuel only ... normal fuel un-useable!
2. Riding in 6th gear, you'll have to downshift to 5th to overtake, even if you are at 8000 rpm ...
and don't even THINK about carrying Luggage or Pillion ...
3. Riding position very uncomfortable ... it is Sporty, but about touring?
4. Too expensive for a 125 cc... 3000 Pounds. Rs. 2,40,000+ Taxes?? for 15 bhp only?
I say this because I have read those people's opinions who have R125 ... believe me!
& With R15 you get service, insurance, more power. So, Still want to pay more price for 15 bhp, instead of 17 bhp @ better price ??
Go for R15, I say ... but for almost the same cash, have you considered Ninja 250, to be released soon in India?