I feel like watercolor is a thing you either LOVE because it's fast and free feeling or HATE because it's so flipping hard to cover mistakes, though I've gotten better at adjusting sections where I make "mistakes" and knowing what I can/can't fix. I honestly don't have the patience to paint with anything else because it takes so long for acrylic and oil to dry. I would go crazy! Plus, I love the transparency mixed with the dark, thick, opaque lines of india ink. It's perfect for comics!
As far as brand of paint goes, years and years ago, my mom got me a bag full of second-hand Winsor and Newton watercolors for cheap off of ebay. As she puts it, this was back before people really priced things appropriately on ebay and you could get some sweet deals! I've gradually added to the collection/replaced tubes as I've used them. Since they were second hand, some things were more used up than others.
I really love them, and I'm very grateful the paint lasts so long. If you're thinking of trying them again sometime, I think there are other high-quality sets that are cheaper, but they're great, reliable paints.
Honestly, the bigger issue with watercolor is the paper. I wish I could afford good paper, but I just use so much making the comic. As it stands, each episode costs about $1.50 to make, just for the paper! And I'm not even using the fancy stuff! Like, I can't count the number of tutorials that try to talk you into splurging on paper and I'm there going NOPE! This girl ain't paying for Arches until, by some miracle, the comic pays for itself!