I've only ever tried about 8 - 10 juices because I'm still very much new and am a trial and error stage. My favourite local (Malaysian) juice is by far peach bubblegum by Vapor Fuel. It's very smooth and has good vapor production. Only problem is that the flavour is very hit and miss. Sometimes you can really taste the peach and bubblegum, but sometimes you can't taste much at all. I initially thought it was due to vapor tongue but when I left other people try it, they can't seem to taste anything either.
As for imported brands, I picked up Suicide Bunny Sucker Punch because of the great reviews and I could tell that I like the flavour... But, it gave me a horrible itchy throat hit. I bought a 6mg nic level because that's what I'm used to with my local juice, but this was really different.
So I picked up The Milkman because that was the only imported juice available at 3mg over here, and it is great. It's my go to juice right now, though I think the Sucker Punch would've beat The Milkman if I bought the 3mg (which is not available here).