I am a long, long time Kamado user. I was using a BGE when virtually no one had even heard of a Kamado. Over the years, I've had a couple different ceramics, then added a Broil King Keg, and then my Summit S6. I would never go back to my ceramic Kamado. My S6 is the best overall grill I've ever had. (The Keg was an interesting grill - it really was a horrible smoker, but that thing sipped fuel...I could cook at 600 degrees for hours on a single load of lump - it was crazy! It was far too well insulated). I always found the design of the ceramics too DEEP, and not wide enough - vertical cooking when I wanted/needed horizontal space). I always watched for a PRIMO ceramic cheap - the oval shape would probably be ideal, but I found cracking issues too common with them.
One of SmokingDadBBQ's points (I've seen all his videos over the last few years) is that he tends to focus on that the ceramics are better at smoking - and I will agree with him on that aspect. My thought on that is the same reason I ALSO think the new Hunstman will also be a better smoker than the E6/S6 - they are less efficient and will produce a little better "blue" smoke. The same reason NONE of these grills are as good as stick burners (that are even LESS efficient) for smoking. That said, SmokingDadBBQ also rarely does any other type of serious grilling type comparisons and personally, I do FAR FAR more high temperature roasting cooks, direct/indirect grilling etc than I ever do pure smoking. Part of having the "best" grill is picking the one that is best for you! i.e. most of his comparisons are meaningless to me.