LaBat has been discussed on here before and I actually have heard they are pretty good I can't say personally because there not here up north. Glaziers down near you is owned by GFS which is who I work for and actually I think they want to eventually integrate Glaziers into the Gordon Food Service system and make them part of the company instead of just some company Gordon's owns.
If you work for Gordon's chances are you'll probably be on a route at first, however Gordon's now and then and I mean now and then hires transit drivers off the street, but it does not happen very often usually you have to work at Gordon's as a chain route driver or broad line route driver for sometime before you can move over to transit. If you work for any food service company I would expect to be on a route making deliveries. It's been my experience there is no slow down, were busy or busier, late August were busy, holidays were busy, after the new years the loads get a tad light on certain days, but nobody gets laid off or anything like that.However usually around February things start to pick up again and there is always something to do.
Sysco you'll be on an extra board working as an extra for a minute until you can bid on something or they have some place to put you, probably a combination of routes and maybe shuttle. GFS has a much bigger much more expansive shuttle network then Sysco. GFS runs way more transit shuttles then Sysco does.
However I would expect routes first. Food service shuttle is all night work. Now Gordon's does have an early shuttle, but that all depends on the warehouse your yard is loaded out of and how busy that warehouse is. When our yard was loaded in Detroit area, we had an early set that went and got the skip routes those guys set out at 2-3pm and got back about 10-11pm. When our yard was switched over to the new warehouse in Pittsburgh, PA area the early set abolished and transit set out later and it's all night work. Now over time the warehouse in Pittsburgh will become bigger in sales volume, but that may take years to happen. The reason for the Detroit warehouse having an early set is because A. The company is from Michigan and outsells every other company in Michigan and also B. The warehouse in Detroit is older, has been around in the company since they got going big in the 1980s is responsible for Michigan loads, Ohio loads, Chain loads and Marketplace store loads it was to much for just 1 shift to manage.
Pennsylvania though was another story it was built because of emerging markets and also because Detroit could no longer handle the work load it was to much for them and Springfield was already to swamped and they needed a place to put North East, Ohio because Springfield outgrew us and Brighton didn't have room for us.