Mathbf, cause we’re best friends.

Arrows are more descriptive. \vec is better.

Neither, I just write a symbol.

If you like mathbf more then at least redefine vec and use vec. Keeps the code more tidy.

\mathbf{} cause I can just use Ctrl+B on overleaf.

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\mathbf. It’s consistent with \mathrm for well-defined constants

All in with the crabs.

I haven’t heard those names in a long time…