I'll just grab whichever 3" or 4" grub is available.  They all work.  (I'll walk to the zoom section first though). 

I've fished grubs off and on over the years, starting with Mr. Twister grubs, then Riverside grubs from Wal Mart. Sometimes if the fish won't hit a larger, flashy spinnerbait, they'll hit a white 3" or 4" grub. These days about all I carry are Zoom Fat Albert grubs.