Thanks - I'll probably order one and see, Sounds as if it will do the job.
I had a good look at the article, but it still doesn't answer the question of whether round or square is better.
I have to assume it's more than just a fashion deal;)
I encountered this recently with the X2T-F (most recent firmware) simultaneously on my xt4 and gfx50s - I just spent an hour on troubleshooting and (for me at least, and for now) this worked:
disable the LED AF switch on the godox transmitter, make sure that LED AF is also turned to "off" in the TTL settings of the camera body.
fired a couple of hundred strobes like this with both bodies with no freezing occuring.
firmware xt-4: 1.23
firmware gfx50s: 4.30
firmware godox x2t-f: 1.1