I have the Goblin, Goliath and Cthulhu.
Goblin - Best all rounder.
Cthulhu - Similar to Goblin, goes through juice quicker. I have one from the 3rd latest batch and machining isn't bad. Not the smoothest threads though. Had more problems with wicking compared to the Goblin, leaking from airflow. Better with a lot more wick in the channels. Top fill is useless, leaks from airflow after filling opening it up. Bottom fill hole is also useless with pipette bottles even pointed pipettes. The hole is smaller compared to the Goblins, probably be alright with plastic or needle bottles.
Goliath - Downside is how quick it gets through juice, quicker than both the other 2. I also think it's an ugly little fucker now lol. I think if this went through juice at the same rate as the Goblin, then it might just edge it. In comparison, all three provide the same vape, flavour and vapour production I think, Goliath might edge flavour but uses juice at 3x the rate of the rest. Need to be careful with the build as it can touch inside of the chimney, if you don't build close to the posts.
Winner for me is still the Goblin, I can take it out and not run out of juice. Unless I want to carry a bottle about. With glass pipette bottles.... I don't think so.
Lemo 2.... My first RTA, minimal use since I got all the others.