Many of the current tanks are sub-ohm, or at least lower resistance which burns through juice faster. Evods are nice and easy to rebuild the heads. If you just buy replacement heads, the old single-coil Evod/Protank heads should be cheaper. The larger tanks can also have rebuildable heads available that makes life easier/cheaper. I wouldn't say the larger tanks gunk up less or are easier to clean...it depends on the juice, how much you vape, what power/heat, coil head configuration, etc. I use to make Evod coils last a month with some light juices, but maybe only a week with others. Same thing with the bigger tanks. The main question is how much do you vape? I moved on from Evods when I got to re-filling it 2-3 times a day.
I still have my original Evod (1.8ml) tank from 3 years ago, along with a couple of glass-body clones. I carry one as an emergency backup in case my RTA has a catastrophic failure while away from home. If you are a mouth-to-lung kind of person, Evods work well. Very thrifty on juice, excellent flavor, cheap, easy to rebuild. If you're happy with it, don't sweat it.
Most of the newer, larger tanks are going to have more performance, but more vapor=more juice burned.