Cannisters are ok, but the best will always be a sump system unless you are after a FW
The sump increases the volume (Adding stability) and with a wet dry can handle the messiest of predatory fish (FW
). In SW
you can then add on a refugium and grow macroalgae or lay down a DSB
to control nitrates and aid nutrient export.
If I am doing a reef i tend to leave out a wet dry, but otherwise they are still one of the best ways to go.