I'd recommend I-5. I took 99 once and came across heavy traffic in the bigger towns. The condition of the roads was pretty poor, although it may have been resurfaced since.
On I-5 the big names are Pea Soup Andersen's near Gustine, and Harris Ranch Inn and Restaurant near Coalinga.
https://www.peasoupandersens.net/homeSantaNella.html
https://www.harrisranch.com/home/
But on 99 it's all the major towns like Modesto, Merced, Fresno, and Bakersfield. You can look up whatever kind of food you want whether it's fast food or sit down restaurants.