Of then list up there, I’ve owned and singlespeeded the Singular Hummingbird, On-One Scandal mk2, Stache and Fuse.
Singular was just the most lovely bike and I only swapped out because of the wheel size. EBB was fine.
Scandal was agricultural but rode very nicely. Track ends were / are low tech and work well with a chain tug.
Stache was great; shorter in reach and steeper in head angle than the Fuse and my FS, but an absolute hooligan to ride – so much fun. The sliding dropout arrangement was set and forget, but bear in mind you’ll need a socket or spanner to adjust. My main gripe was seatpost insertion because I’m short – but the carbon version has more drop IIRC. Massive tyre clearance – I ran 2.4s and it’s designed for 3.0s. Super short chainstay makes for much fun.
Fuse is longer (at the front – rear is 430, maybe shorter – can’t remember)and slacker and that’s no bad thing. It’s not as zesty as the Stache on steep stuff, but I’m running the wrong offset forks. Who knows? Dropouts are simple and just work, lots of clearance for up to 2.6. For my height and riding style, 430mm chainstays seem to work, but equally I loved the Scandal at 445. I have a second hand 2020 Fuse Expert in brushed and clear coat finish, and it’s (subjectively) a very good looking frame. The only thing I’d change is the seatpost bottle bosses, which mean I can’t put a longer dropper in. But that’s a super minor issue as 160 seems fine.