I voted Minimig. None of the others are currently available.
I thought the replay board used a further developed minimig core with additional soft 68K. So it should really be called minimig 2 when it is available.
Also I thought that Yens had given up on CloneA as a system due to belligerence from scAmiga.Inc and was only going to use elements in add-on boards etc.
Natami has been so long in coming since publishing wonderful accounts of performance and compatibility. I don't get how it can take several years to go from that point to a finished motherboard. I get a Dragon feeling about the Natami.
So really we have only one choice; Minimig or it's derivatives.
Note to MODS - I have tried not to use any humour or offend anyone in this post which is entirely my opinion. So please don't ban me.