FWIW, I tried several pod mods. The only one that never leaked is the Sceptre (for me, anyway). It may not be the best pod mod, but I don't want a leaker since I use them for outings mainly. Caliburn is very popular--never got one. My Voopoos are terrible leakers. And some even autofire.
But there are so many out there nowadays, I really can't help much.
I really like the caliburn g2. The Xros with the new pods never leaks. I rotate two at work.