What tanks you like are going to depend on your personal preferences.
Do you like cartomizers? Clearomizers?
I prefer the Clearo tanks. I love my Arry tank.
I have 2 acorn tanks from parkes as well, I have mixed feelings about them, the small one doesn't hold much, but is reliable, & I use it as a back-up. But the larger one has a problem with the bottom rubber piece popping off randomly with the slightest bump.
Clearo tanks also have no filler, and you don't have the issues of punching or cutting cartomizers, & I had lots of leaking and dry hits with the pre-punched cartos in my liquinator. I'm not a fan of cartomizers in general, but having that tank just sealed the deal on me never buying another carto tank.
Also some liquids can cause poly tubes to crack, so you have to watch out for that. If you have a juice that will crack a tank, you may want to look into the stainless or pyrex tubes that some tanks offer.