Mine field question that.
There are quite simply, a ton of jig head designs.
To be frank, most are using the wrong jigheads for the application.
The Bachi head has gained a reputation yet, it is totally wrong for most of our fishing. It is a tube skirt jig designed for tube baits.
The football head has thankfully gained a following for the HRF and people are using them correctly in most circumstances.
Many weedless heads are really awful. and have hooks that turn back on the gape. These are designed for 'worms' and not slug baits (xlayers, sluggos, etc)
The round ball is likely the best all rounder but...
There are 90 degree, 60 degree and in-line tie positions. 90 is great for HRF, 60 is better for shake-it styles and in-line better for retrieve styles and for retrieving through the tops of weed cover etc.
Stand up heads ? forget em, they don't really work unless you can guarantee a flat working platform.
There are quite a few discussions on here and on various internet sites. The best places to look re: jighead designs are Largemouth/Smallmouth Bass and Walleye sites.
As Britain catches up with soft lures, the overall knowledge will improve and, the use of certain tackle being adopted right now will change as we find what works and what doesn't. It's a natural progression.
Don't ignore jig head design thinking it's just a weighted hook because it's far, far from it and it WILL affect catch rates dramatically one way or the other.