I installed 1/4 turn tops on sinks. The inspector says I need to remove the 1/4 turn stops and install Aquaflow 1/4 turn angle stops. What is the difference? Is Aquaflow a brand name? Are there manhfacturers?

Aquaflow is a brand name.

I'm not sure why your inspector requires a specific manufacturer, but around here we buy them at Consolidated Supply.

Call around to a few of your local Plumbing supply houses to see which one carries the required stops.