Any competent fighter pilot would take the fight to the vertical using speed and ability to climb. Doubt the Warthog would have much of a chance.
It is like when F-4s fought F-5s. Neither plane had an advantage per se. One was good at one type of fight. The other at another. The lesson was to fight your own fight and refuse to fight the enemy’s.
No matter what direction the A-10 still pulls a tighter circle at anything close excluding a harrier B and the A-4.
The Mig-21, F-5 and A-4 were about the same with the teen fighters, if you did not pull lead in half a circle in a F-16 you better change the type of fight. The A-10 would not fair well with the A-4. The all aspect sidewinder on the rail keeps most interceptors away from flights of A-10 with/without 4 ship F-15 protector.
Combined packages of the USAF keeps most flights safe.
I flew Air Combat USA with ACM trainers; dog fights are basically flown in an egg shape both vertically and horizontally and around 300kts. A Hog will also head down into ground clutter where the AIM can't see them.