I had bettas over the years as well. Both combined in a community tank as solo. As long as if a betta can create it's own spot in a tank, there's not much to worry about. But of course, it also depends on with what kind of fish you're combining a betta in one tank.
Betta and barbs go well. If you want to combine them with guppies, I would suggest to take short finned guppies.