Currently I use classic Amiga and MorphOS in near-equal parts. For my purposes I voted MorphOS, as IMO it's a good balance of 'modern' OS features blended with 'legacy' feel and compatibilty. If it was about future potential though, I'd think AROS by its nature would be most likely of the bunch to rise above "one of the Amiga-style OSes" to "alternative OS" on a larger stage.
