I would go with a betta , no contest. Much more personality, easier to care for, and you
Don't need as big a tank. They Definetly are my favorite fish! Here are mine:
Here's my male, raja, smiling for the camara
And prim, my female, posing
So far everyone who owns a Betta votes for Bettas (more personality!) and all the Goldie keepers vote for goldfish (more personality!)..
I would do a Betta if you are a fire or earth sign of the zodiac, and choose a goldfish if you are air or water sign. Ta-Da!