I haven't tried a lot of juices, I got into DIY pretty quick.
My favorite purchased juices, in no particular order:
Mom and Pop's RY4
Mom and Pop's RYO
Mom and Pop's Tobacco Dolce
Dekang Camel/Desert Ship- taste to me exactly like V2 Cigs Sahara
Dekang Watermelon- a little light, better with a few drops of menthol
Hangsen 555- dry, a little harsh. Great with beer.
Liqua Tiramisu- too dry/coffee for me at first. I revisited it a couple of days ago and it's now one of my faves. The few people that have tasted mine have loved it.