Between front and rear or vice versa? I have goodyears on the front and sumitomo's on the rear. Same size but when I needed new tires the sumitomo's were dirt cheap. I know they wont hold up as long as the goodyears but I'll deal with it when they need to be replaced.

 

I stagger widths and compounds sometimes. I've got UHPAS tires in the front and UHP tires on the rear right now for fun drifting in the rain.

 

I usually run drag radials on the rear of my rwd cars.