I've had several different kamados including the Bubba Keg (which is what it was called by the company who originally invented it before they sold it).
The keg has an upper swing grate that is just awesome. I love that feature. It's also much more durable and portable than the ceramic grills. They burn MUCH less charcoal. I've never measured the exact amount by I'd say less than half of a similar sized ceramic. Unlike ceramics, you have to get a keg REALLY hot on the inside for the walls to feel too hot to touch on the outside. There are no ceramic parts that can crack.
The ceramics have way better temperature stability and they are easier to bring the temperature down when you need to. They also feel more substantial because they are (they weigh almost 3 times as much). Assuming you don't drop them, ceramics will probably last longer because the body won't rust over time.
If you need to move it, the hitch, weight and durability make the keg a no brainer. If it's just going to sit on your porch, I'd probably go with whatever is cheapest unless you are going to be doing a lot of low and slow...in which case I would recommend a ceramic.
For the record, I'm currently driving a kamado joe and it's my favorite I've had, but seriously, I don't think you can make a bad decision on this one. They are all awesome.
I hope this helps.
