neo geo is a great arcade perfect machine if you like shooters and fighters, other game styles are a bit thin on the ground, not the hardware's fault,it's more than able to handle many game types, it just happens to cater to arcade style games.
I sold mine after a while, as I'm more it to rpg, 3D and strategy games.
I found the PC-engine more varied, with software easier to get hold of, and more choice of hardware.
I think the A1200 could of coped with quite a few neo-geo style games, as fightin' spirit proved. But i guess AGA never got as much effort as OCS/ECS. Lack of disk storage space was another issue as well I suppose.
