I think the Engine is a really good, or maybe even the best allround
tank to date, but flavourwise alone, there are better options.
Perhaps you can take a look at the Wotofo Troll-Rta or the Digiflavor Fuji GTA. If you wick them right, they don't leak as well.
If you don't mind to try an RDTA, I highly recommend the Ivogo Rock RDTA, although there seems to be successor, that looks interesting too.