To maximize positions, this is the best swing. It includes removeable straps with good adjustability allowing all of the creative positions. Additionally, from this solid base, you can add squatting attachments, or cuffs to increase the number of positions. You can also buy door mounts to convert it to a door swing and add all of those positions as well. This swing is also the only swing that comes with handles, yeah they can be added to others, but here it is just standard.
The Screamer Dual Hook Sex Swing can be used in 23 out of the box, but with accessories, an additional 16 positions can be added.