I always say there is really no wrong way to play as long as you are having fun and not making a nuisance of yourself to others. Some people will focus on a single toon others have a spreadsheet to keep track of their 101 total toons of which 16 are not lvl 10 yet but 54 are at 50 (you need the spread sheet because you have to keep track of the incarnates and so on, don't ask me how I know). Or use spread sheet for badges (switched to using Badger myself but have the sheet JIC). I have soloed leveled toons, used the April event for speed leveling (record of 1 to 50 in 2 hours according to in game NPC, also have 2896 hours for the leveling to 50 and while not really up to date have over 3487 hours of total played time). God I love statistics, maybe. But again play how you like that is what is great about the really good MMO's they let you do that.
CoX Toon List.ods