Dependant on your height/weight/strength kinda determines what you'd get - But again at the end of the day it's literally all down to personal preference. 24's are considered more "flicky", short and snappy bikes so they're easier to throw around and possibly even the better option for street. In contrast, if you're looking to be trying out some 'pure' or natural trials too then a 26 might be a good thing to look into more as they're considered better for rolling up stuff, you can get more distance on them, less rolling resistance and all that. Yet again, as a few people have said already it's better if you go try out the different sizes first - I wouldn't even take shops into account as trials is basically dead anyway, just find some local riders on the forum and ask to tag along and get them to talk you through it all. I rode dj for years on end, so i was convinced i wanted a 26" street bike to match sizes and geometry - But I've somehow ended up with a mod and 24" natural bike
