Ed h got it bang on, the fit is all important. Either of the 2 you selected would suit your needs, but if one fitted better than the other, then choose the best fitting pair.
Your problem will be in finding a shop that stocks other brands, as Scarpa and la Sportiva are pushed by the main outdoors chains. Aku, Boreal and Asolo make similar products, but finding a shop where you can try them on might be a problem.
The fit between the Trango and Charmoz is quite different. I couldn't wear either of them, but that is due to the shape of my feet. Personally I found the Trango a bit soft at the metatarsal flex area, the Charmoz was stiffer there.