I have seen several recommendations for using the Gama Horizon Head jig head for soft plastics and mid-strolling. Besides a sharper hook, possibly, what is the difference in bait movement with a mid strolling retrieve between a regular round ball jig head and the Gama Horizon jig head?

Lower and slightly forward mass of the head in relation to the line tie

I think a lot of it is a marketing strategy.

Allen

The weight goes further down the hookshank. Look at the weighted area on the hookshank - goes nearly half way down.

Horizon style is mostly about posture and tracking, not just hook sharpness. The head shape and tie point usually keep a minnow bait running flatter with less random roll when you slow down, while a true round ball tends to wander more and can roll easier as retrieve speed changes. Round ball absolutely catches them, but Horizon heads are often easier to keep consistent when fish are following on forward-facing sonar and you need that bait to hold one clean lane.