Q. My first question is that which bike is better RS200 or R15 V3 and second question is which bike engine is long lasting with efficient servicing?

I have ridden it continuesly for 6hrs ( i took 1 minute breaks after every 2hrs to stretch my back) in harsh rain.so i didn't think r15v3 is uncomfortable that much,if you put pressure on hand it will cause numbness,numbness is the only additional thing that you are gonna feel on v3 comparing other bikes.i would never say that r15 v3 is uncomfortable, because if you ride any bike for more than 2 hrs , you will feel uncomfortable

If you are asking for raw power than go for rs200 but overall complete package would be r15 v3...with its its too its butter smooth engine and good power with fuel economy..and dual channel abs...which does not comes in rs200

RS 200 is better option as rs 200 has more power more torque and it has backled light switches ..which no other bikes or superbikes provide