I tried
Standard GSA. A bit too tall for me, rather hard and a bit narrow.
Kahedo low - Horrible riding position with ape hanger bars and scrunched legs so that lasted under 1 mile.
Sargent standard - People rave about these but the standard height dug into my thighs at the edge and the pan shape width made it hard to reach the floor. I never actually drove the bike just sitting parked was enough to avoid that one.
Standard GS - A bit soft for me and mine had a sort of block at the back right under my coccyx. I did maybe 100 miles with it.
Standard height Kahedo - Absolutely fab. Comfortable, no sides digging and reach to floor same as standard GS.