In all the three aspects you have mentioned my friend, RS200 is better. For long drives the riding position isn't so aggressive, which makes it easier to ride long distances. Your girlfriend would be more comfortable plus u both would look better on an RS than an R15, she won't feel like sitting on the floor above you. Mileage would be more or less the same. My RS gives around 37-40 in traffic. RS is 200cc. Also it is heavy. I have experienced that is has been stabler on road and highways, although its weight isn't so helpful during sharp turns. For your purposes mentioned, RS will be a better option.
Yamaha YZF R15 V3
