I find the service at GoGo attrocious. I would definitely recommend against going there. They exemplify a "I'm too busy, so make your order in 5 seconds and never call me to your table" attitude. They wouldn't even remove ice from bubble tea I specifically asked them not to put ice in. They said something to the effect of "we're really busy". When I insisted, it was, "fine, fine". Then they took it away for 10 whole minutes. Finally, they came back again with the tea, saying, "sorry, we're too busy" again. The ice was still in the tea!!
I'm also not a fan of Pearl Drops. To me, both their pearls and milk tea have problems.
Dragon Ball is for sure my top pick. Fresh fruit, incredible pearls on a good day (I think they must use something very unique to flavour them), and the milk tea blended so you can definitely taste both the tea and milk. That said, the quality isn't always consistent, but that just seems to be the nature of bubble tea. For pearls, does it partially depend on the weather (i.e. humidity)? I know a lot depends on the length of time they're cooked or sitting.