Speaking as objectively as I can:
CERAMIC KAMADO PROS:
Superior heat retention, which means more consistent cooks during low and slow, no matter what the weather is.
Ceramic won't ever rust or corrode - good durability in cold weather climates; You'd want a cover for the grill stand, however, which is made of steel.
Most have removable heat deflectors that sit directly over the coals, allowing for use of the whole grate during indirect cooks, which is nice.
Most have decent gaskets lining the lid edge and bowl lip which helps with heat/smoke retention.
CERAMIC KAMADO CONS:
Weight - all are super heavy and fragile (an 18" ceramic kamado is just under 300 pounds), so you can't take them with you easily.
Cost - the 18" kamado joe 2 (not the newest one) still costs $1,200; if you want to go up in size to the 24", it's $1,900. If you want the newest model, add $500 to the old price.
MY THOUGHTS:
I could never justify the price point with a kamado. In order to get the same grilling surface diameter that I have with my Weber 22", I'd have to upgrade from the regular kamado (18") to the "big" kamado (24") which would destroy my bank account further. Even though some kamado owners will say you get more grilling space in an 18" because you can use upper and lower grill grates, unless you're planning your cooks meticulously or are Gordon Ramsey back there, it's cumbersome to actually use both grilling grates at the same time. I can do everything the kamados can do on my 22" kettle - sear steaks, low and slow ribs/brisket/ roast chicken, etc. And I don't have to take out a third mortgage to do it. I'm sure that the ceramic kamados aren't exactly cheap to manufacture, but make no mistake - they're overpriced. Weber has been the leader/innovator at the very beginning. There's a reason why their classic kettle design and subsequent innovations have been copied by everyone else. I've got a 22" kettle at my MIL's cottage in Michigan that's been in the starting rotation for over 20 years, and it's still in great shape. You gave your old kettle to your son - what does that tell you? I would get the new blue premium Weber and not look back.
Hope this helps - good luck!