As topic says, im wondering when you should use a guardian and when you want to go with a giraffe instead for example.

i would guess a giraffe if you plan on switching off your tower toon, guardians on the character who will actually be out during the round.

giraffes will have higher stats, and the guardian needs to be out to give the bonus, soooooooo thats my guess.

personally i dont go anywhere without my guardians xD , app guardian makes towers op

I c, thx :). Currently using my app as tower toon and huntress as dpser. Perhaps I should consider going a bit more hybrid on my app and get a guardian?

in that case use the guardian on your hunt and
leave giraffe on the APP - the character that you aren't actively using.