AZO or ORLY or 50/50 ?

Well I see ORLY had pretty good 4th qtr. In 2021. I assume because its hard to get new cars there will be, and probably always is, a demand for car parts.

So I'm thinking of starting a small position in car parts.

I was thinking of going with ORLY, but using portfolio visualizer I see they've both done well since 1993. Some spans one or the other does better.

So would you add ORLY, AZO or a little of each?

If not, I think I'll just go with ORLY.

THANKS