If you're using .anythingbesidescom (for example.io) then get the .com too

Besides that it really doesn't matter unless you're a million dollar brand.

There's better ways to spend $10 in your small business.

If you have a trademark on your brand name, and someone else tries to squat your name in another TLD, file a trademark dispute to force them to release it. (Assuming your trademark isn't a generic word like "apple" where someone could conceivably have something like apple.accounting without being confusingly similar)