I really think its important to have a variety of both.. When using wax worms or eurolarvae I usually will use a horizontle jig.. I think you get better action from them. If I am using minnows as bait I will run them on a verticle jig. Just my opinion. Often I will hav eone of each, I will be jigging the horiz, while I will run a minnow on the other and have it under a bobber!
