Same setup, and similar feelings on it as Stu McGroo above.
I’d say for security, and simplicity once setup, then slot dropout is the best way, as it doesn’t require any tensioners or anything. Can be a pain to setup initially though, but once done, it’s all good. No more difficult than setting up a singlespeed though.
Or if you can, a frame with an EBB is a good choice. As long as the gear ratio means you don’t have to have the BB in the extreme forward, or extreme back positions which then messes up your position on the bike (as happened with my GF Rig, though obviously choice of gear ratio will make a difference here).