Gosh....advantages/disadvantages....
I use clearomisers (glass and plastic) and cartomisers
in tanks and have tried most things.
A simple cartomiser is nice and easy to use and normally gives a reliable vape. In a tank, if you can get it "right" it's a magical creation of super-vapour and impressive taste. A clearomiser can be excellent too....don't get me wrong, I have some mini protanks and love them.
In regard to maintenance, IF you simply replace the heads in a protank, nova, evod, CE clearo/glasso, then they are faff free, almost.
If you rebuild, you save money, but need to weigh up the trade off.
I like cartos in a tank. They eventually get weaker or poorer, then you need to go through the ritual of setting them up again. I think I enjoy this more than messing around with clearo heads.
(I hope this will make some sense)
