Either type of filter has its advantages. Cartridge filters, if filtering a clean, clear pool, probably do the best job--they filter smaller particles than a sand filter. However, they don't work worth a flip if you're trying to clear up an algae bloom, because live algae clogs them up quickly, and you have to stay on top of cleaing them to keep your pump from burning up. They are also typically mismatched with the pump (pump being too large) when coming from the factory. Cleaning the cartridges can be a PITA, and must be done on a regular basis. MOst people keep one in the filter working, while the other is out being cleaned.
Sand filters are usually bigger, and not as likely to be overdriven by an AG pump, they are better at trapping live algae, and you have the option with a sand filter to vacuum to waste, if there's something you need to vac out of the pool but don't want to go through the filter. Backwashing (cleaning) the filter is quick and easy, although you do lose a good bit of water in the process. However, they don't catch particles as small as a cartridge filter can (unless you add a little DE to the sand).
there are people out there who love their cart filters, and people who love their sand filters, so you're liable to get lots of opinions on this one. Me, I'm a sand filter fan
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