Depends really, like others have said if you use your bike to get around aswell then i would go with gears but if your always riding Trials and can be arsed with going round in one gear then go ss. SS is alot easier in my opinion, with gears there's alot more what can go wrong e.g. cables, mech, shifter, making sure that the gears are set up very well. With ss it's just a fit and a forget really, just wack the cog on stick tensioner/mech on align it all up and your ready to roll, ss also saves weight but who gives a shit about weight at the end of the day. Go SS.