They both have their pro's and con's. Overall the GSA is more versatile and nothing beats large top loading panniers for living out of while on the road. The GSA is lighter and more lively. The GSA emanates no intrusive heat onto the rider. But .... nothing devours miles so easily as the mighty ST-1300. Another huge plus for the ST is the lighting. Those huge dual reflector housings light up the night and greatly reduce eye fatigue. Especially with the LED bulbs that I've installed. The only thing I struggled with on the 3 Iron Butt rides on the GSA was eye fatigue. My eyes have been getting weaker anyway, so they start getting batty from all the artificial light sources on the road. The ST showers so much more low beam light out there, that my eyes are not as affected. That being said, the ST may be moving on to a friend and co-worker very soon. That may help me slow down and quit obssessing over Iron Butt rides. Especially if I also install dual-sport tires on the GSA. I'll just have to screw around and ride more leisurely. It's not easy being me.