Tao:
Tao is one of the best characters in the game, but has a high execution barrier and fundamental knowledge to play her correctly. At first you will probably die alot, but soon you'll end up feeling very rewarded after you pull off that 6k damage throw combo in the corner that you've been training on all this week. I enjoy watching Tao, it varies from person to person, flying around the screen and making stuff happen is pretty cool.
Tsubaki:
Tsubaki is one of, if not the weakest character in this installment of the game. That no where near means she isn't good enough to win (People still win tournaments with her). Thats where the fun and enjoyment comes with her, beating someone with her. Going crazy with all her gimmicks and fancy unblockables and opening up the best of players to the power of Tsubaki, to landing those insanely clutch 5 bar mugen combos for that 5-7k damage. I do enjoy watching a very good Tsubaki (Even though I hate fighting one -.-).
Noel:
Most people dislike watching Noel and find her irritating. This is probably because of CS2 where Noel was one of the best characters, or it is due to her unique playstyle that utilizes her drive normals. Shes not that strong in this game, but she is still capable of achieving high damage and frustrating your opponent and limiting their options when they have you knocked down. Hitting those very important 4D Fatal Counters and then RTSD after scoring a 4k+ combo with corner carry is very fun, especially when your opponents get mad at it. She also has her CSEX haida loop now which can be lots of fun to learn and execute it on real opponents. I like watching CP players play Noel due to her new style.
If I was to say who you should main, I would have to say whoever you like/adapt to best. For instance, my favorite character is Rachel, but I can't adapt to her playstyle for the life of me. Instead I like to play characters like Platinum, Makoto and Tao which fit my playstyle more perfectly.
Who did you main in GG? Maybe find a character in BB thats similar to them and begin with them. One of the best pieces of advice I can give you is to find 1 character and just keep at it with only them intill you can master them. Then go onto other characters within the roster. Do not start changing mains every month.