A good bright color for smallmouth is "ElectricSnot"...green chartreuse (or yellow chartreuse) with rainbow glitter (black, red, green, blue...whatever to got).
Super wacky worm color.
I've also done surprisingly well with white wacky worms and really well with white minnow baits (like a grub or 4" carrot). The bright colors are good if they are on the bed (or just about ready to bed) and you often just see the worm disappear without feeling anything because they are hitting it and running towards the boat (direction of retrieve).
FYI...The Freedom Fry mold is a super smallmouth worm, especially wacky but I also like to fish it Carolina Rig or Lindy rig (for us Northern folks).