I've used both drugs in the past.

I've gotten burns from Baytril and have learned how to inject it to avoid the scarring.

Fortaz is a promising drug and can be especially effective is done with an Aminoglycoside such as Amikacin. They work synergistically.

I would never treat an infection without a Culture and Sensitivity test though.

You may not need either one after the results come back, and that you ended up needing a totally different class of drug all together, such as a Sulfa.