What hose bib to use?
I would repair the valve assembly less than a dollar for the seat and some valve packing.
If you want to replace it it is a sweated fitting standard 1/2 nipple goes on the inside of the fitting for 1/2” and 3/4 goes on the outside of the fitting or that is the style I purchase under 10$
Edit
I looked up the style I use 1/2”. 3/4” brass SWT x mHT no kink hose bib $7.97 at home desperate.