The bottom line is that taste is subjective. I have an iClear 30 here that knocks my socks off, no matter which juice I put into it. I have ANOTHER iClear 30 that I bought from the same company at the same time that mutes juices like nobody's business. I can't even get a clear read on a juice if I haven't brushed my teeth first. I've been getting plenty of flavor from Boba's in my Protank, but then I've rebuilt it with mesh so...but even when it was just using the standard silica build the taste was FAR better than other clearos and cartos I've tried since starting last May. I'm going to get an RSST here soon and rebuild that with mesh/ekowool and see what kinda flavor I get out of it but really, it depends on your mouth. If I drink pretty much anything other than water, the juice never tastes as good unless it's Highbrow's Diablo Cappucino and I'm drinking coffee, that juice is just ehanced 20 times with coffee. Other than that, you get what you get. At some point, it's not the juice and at some point it's not your delivery device, it's your body.
When I start to get vaper's tongue from vaping Boba's, I'll go to a fruity juice like Honey Pearry or Backwoods' Brews really wonderful Peach vape for awhile. Once I go back to Boba's the taste is as full as ever. Figure out your flavor profiles, figure out your mouth, than figure out the flavors.