Hi itskrod00,
I have a lot of hands on experience with the Summit and we also sell Kamado Joe grills at our store so I'm very farmiliar with the grill...
Bottom line - both are fantastic units that will produce top notch BBQ.
...but that doesn't help you all that much, so I would say these are the advantages/disadvantages of each:
Weber Summit:
Advantages vs Big Joe:
- Swapping between grilling and smoking much quicker/easier.
- VERY easy to move around in comparison to a ceramic (If you are going built-in this obviously doesn't apply)
- Extremely Durable (ie - wont crack or break if set down improperly or hit.)
- Can use any type of charcoal
- Time from cold grill to cooking ready is faster
- Built in burner to get charcoal lit (Some still like to use a chimney, but I LOVE the gas assist. Use it every time.)
- Easy to clean/maintain
Disadvantages:
- Not quite as efficient as the fuel sipping Ceramic, but pretty darn close.
- No rotisserie kit
Kamado Joe Big Joe:
Advantages:
- Maximum charcoal efficiency - These things really retain heat extremely well.
- Available rotisserie kit
- Has a more substantial "upscale" appearance some people like for built in applications.
Disadvantages:
- Can only use lump charcoal
- Have to be more cautious with both the interior and exterior of the grill.
- Ceramic interior can absorb chemicals etc if harsh charcoal with petroleum is used.
- Personally I feel the Summit is better suited for grilling
- Not as easy to clean
In terms of accessories, both offer a lot of options with only the rotisserie as the only stand-out that is only available on the Kamado. The other nice thing about the Kamado units is that they come quite reasonable equipped right out of the box, whereas a lot of other ceramic brands make you purchase things like deflector plates, hanging racks, etc etc.
In the end there is no bad choice, but as you've prob picked up on I am a little biased to the Weber
Hope this helps,
Matt