Q. Which one is more worthy for its price? R15 v3 or R3?

You cant compare to R3 bro bcoz R3 and R15 is completely Cc difference and even the performance if you want to 321cc you can go for R3 if you want 150cc you can go to R15 but now Yamaha has discontinued R3 for a while bcoz upcoming R3 BS6 Gone launch soon

YZF R3 is a twin cylinder bike and R15 is a single cylinder bike. R3 is a way more powerful bike than R15 .R3 deliveres bike powers in more linerar and steady manner you can is it in daily commuting also and very relaxed position R15 V3. If you can spend more money you can go for R3 and also NINJA 300 u can consider this also as it as more accessories than R3 and way more cheaper.

R15 v3 is a real sports bike ..riding position..graphics ..engine..r3 is a costly option to tell frankly it dont give a track bike feel..if you have money and dont need to lean can buy r3..