Of those three, I've only tried about 8 from MBV and 8 or 10 from Virgin Vapor. Personally, I wasn't impressed with either (except Bed of Roses from VV, which was amazing and the best floral I've ever tried). A lot of people like both, though, and MBV is pretty cheap to try, if nothing else, to figure out the kinds of flavors you might be interested in. Their Rockstar energy drink flavor was the only one from them that I even considered re-ordering, because when I had it, it was spot on. The others ranged from "meh, it's ok" to "OMG kill it with fire! *gag gag dry heave gag*"
But, as I said, they're cheap and a good place to begin looking for flavors. Some of theirs are very popular, even with people who don't like any other flavors they have. Same with VV.
I like glass bottles more than plastic, except the samples from one company that didn't include a dropper. All of mine from VV were amber glass with droppers, except one sample (out of six) that had a regular cap
The juices in darker glass seem to keep better than those in plastic, but I've never noticed a weird taste or anything from the plastic bottles from any company.
I'll add Seduce Juice for a pretty cheap company to check out. They're a little more than MBV ($5.99 for 10mL, $7.99 for 15mL), but in my opinion, much better overall.
For companies that I would recommend without hesitation, The Vapor Chef and Alice in Vapeland. I've liked or loved almost every flavor I've tried from them.
