FPT,
Whatever you want is fine with me, but backwashing is much easier than cleaning cartridges.
When you backwash you don't get wet and you can do it even when it is a little chilly out. Not so with cleaning cartridges.
If you are having to backwash often, then that sounds more like a chemical issue than a filter issue.
If your sand filter gets dirty fast, then a cartridge will get dirty faster, unless you current filter is very small.
I have a variable speed pump so my filter pressure is only two or three pounds. This allows me to clean it in the spring, when warm enough and in the fall, before it gets too cold.
It takes me about two hours to clean the filters, including disassemble and reassembly..
Thanks,
Jim R.