Postby akley88 » Tue Mar 25, 2014 7:19 am
the r51 has slightly more ground clearance, more torque and the antispin and stability control.
the r50 has the better angle of approach and depature and is lighter. it is also slightly narrower.
it comes down to personal preference. i personally prefer the r51 but thats probably because i own one. i wasnt a fan of the r50 cause of it being unibody.