What's your favorite style of tank? Or biotope?

I've kept freshwater fish for some time now, but after being in the hobby for so long, I decided to try my hand at saltwater fish. It amazed me at how absolutely easy it was to set up and maintain. It's almost easier than my freshwater tanks!

So my favorite tank would have to be my Saltwater FOWLR (Future Reef) and small <20 gallon planted tanks coming in close second.

I've always wanted to try an amazonian biotope though... with angelfish, discus and tetras. But for now, the saltwater definitely takes the cake.

How about you?

Freshwater 29 Gallon US Glass Aquarium nothing special

Is it a planted tank though? A specific biotope? A species only tank? A specific type of fish tank? Invert only tank? Etc. Perhaps I worded my question wrong. LoL! I like the all glass aquariums too, though. :)