I'm intrigued by the idea of mutual supervision. This implies that both process dynamically become the supervisor of each other. By default, OTP supervisors are more architectural in nature -- they will always give you a top-down tree rather than a cyclic graph.
Who restarts who? That's a bit tougher to do when everything becomes cyclic.
Links are bidirectional though, so when one of the workers die, the other can know about it, die, propagate the error or react to it. Monitors are unidirectional and won't propagate the errors, but only report it. I guess you could write your own mutual supervision that way, but it would be a bit weird, still.
Who restarts who? That's a bit tougher to do when everything becomes cyclic.
Links are bidirectional though, so when one of the workers die, the other can know about it, die, propagate the error or react to it. Monitors are unidirectional and won't propagate the errors, but only report it. I guess you could write your own mutual supervision that way, but it would be a bit weird, still.