Quick COmparison between FZ16 and RTR.The first one is for FZ16.
1) Price(Delhi) : 65 and 57
2)Displacement: 153cc and 159.7cc
3) Power (in PS): 14ps and 15.5ps
4) Torque(in Nm): 13.6 and 13.1
5) Ps/ton :111.1 and 113.9
6) FZ has a wider tyre.
7) Both has a disc brake in front and drum in rear.
8) Apache has a better mileage.
9) etc etc
source: Overdrive mags
FZ is looking good and handling is quite nice, i had tested it but not much powerful to me as i rode pulsar 220 FI

FZ will fit you its not tall.
i haven't ride RTR so cant give much about it but i know its good.
RTR is much more economical.Price and mileage.
My advice: TEST RIDE both and make your choice but dont drive too fast