GrubHub was always my go to. That miiight be just because I lived in Chicago when it launched so it was the default for me for so long. I used it pretty much exclusively all through Covid lockdown, but have since stopped doing delivery much. Maybe once or twice a month. I do not have Prime (so I don't have GH+), but my credit card provides "free" DashPass so I now pretty much exclusively use Door Dash when I do get food delivered. If it wasn't for the free DashPass I'd probably still use Grub Hub