In my opinion your client bought the right version but that is a personal opinion. I find desktop a lot easier to use and the picture driven menu is a lot easier to follow. The only thing I can think of that is not neccessarily in an obvious place is journal entries which are in the company drop down menu. Hopefully tour client is local and you can visit them to do their accounts, much nicer to visit a client rather than do everything remotely anyway. The client can send you a backup or an accountant's copy but you'll need the software your end too.