For me, I had Sysco but the Sysco house in Fremont, CA is so unreliable and lazy(drivers constantly late or “forgetting” keys, out of stock items, etc) that I had to switch to US Foods. I’ve had Sysco in two other areas and they were top notch so it pained me to leave them. It’s also not easy adding a new distributor because they have different products and you have a period in which it will take you awhile to find what you want exactly. Things I still miss from Sysco is their easy online ordering and their Arrezio brand of thick cut genoa salami. US Foods also has a product it’d be hard to replace that no one else has and it’s their own brand (Roseli) of 0.5" bacon topping. It’s phenomenal. Better pizza boxes than Sysco too.
Just try one, see how it goes the first few months and go from there. Be happy there are solid alternatives in your area, as there are not in many areas.