I'm going to have to say RTAs. Honestly, they have come far enough that I find the flavor and ease of use to be pretty superior. I did try the innoken lift and didn't care for it much it just seemed unnecessary and didn't really "offer" that much. Well, more capacity is okay, although to be honest as a MTL flavor junkie, I'm not filling my tanks that often, and I prefer the variety of a bunch of flavors during the day and etc. The squonk thing seems to work better for those who prefer ONE ADV, to be honest. For me, filling is not a major chore, and I like having several setups with me.
I'm not sure that it's really a fair comparison (for me) since I haven't tried an actual squonker but I just tend to want variety. I can see how they'd be totally useful/preferred for other folks, but I'm happy with what I have and don't want to buy 12 squonkers, quite honestly.
Sometimes I kind of think it's what you try first, in a way. I have tried many RTAs and have found my happy places, and it seems silly (to me) to spend a lot of money moving from that place just to have a bigger capacity juice well. If someone's out all day and working I can for sure see the appeal of a squonker though.
I also think it doesn't have to be either/or as well. I might wind up squonking someday, who KNOWS.
Anna