Started off with a 2011 RT-L and enjoyed the comfort and amenities when going on trips and/or longer rides.
When I took a test ride on a 2013 STS, I was sold immediately! I liked the riding position and the well designed OEM
floorboards. It had more pep than the RT-L and I loved the handling. Had the dealer install heat grips, fog lights, Akrapovic exhaust and battery tender leads prior to delivery.
The bike was more responsive than the RT and the riding position is definitely comfortable enough to take on longer rides too. I now find myself riding the STS most of the time. To me it is a very enjoyable machine. I am only 5'4" and weight 160 lbs. It is such an enjoyable ride that I keep on adding stuff to improve the performance; adjustable Fox front shocks, BajaRon swaybar & heim links, SpyderPops bumpskid plate, LED center tail lamp and by tomorrow 2014 side panels!
However, if I should go on a long trip (more than 7 days), the RT-L will be my pick because it has so much storage space to carry
the additional stuff needed.
I suggest you go for the STS or ST-L; you won't regret it.