One thing I would like to add is that the bigger, better, easier to access the sump, and the more features it has - then the easier it is to maintain your tank. Especially so with saltwater.
When I had a reef tank I did all my maintenance through the sump. I hardly ever stuck my hand in the tank for anything other than to propagate new corals or to add new corals. I'd vacuum the sand maybe 2x a year.