i will preface this with the fact that I own 3 kamado Joes.
When I started looking I wanted the BGE more than anything. I started researching and was seeing so much hype about KJ. I thought BGE because it is what everyone knows.
I was still sold on a BGE... then I went to my dealer and they had BGE and KJ side by side.
Why did I go with KJ?
A few reasons. I think pound for pound they are very close. Either one you go with you can't go wrong. But KJ stood out after all of my research and after comparing them side by side.
KJ has a better hinge system. It appeared more durable then the BGE. When I got to play with them side by side, the KJ appeared to be better built.
Price was a factor. I wanted the XL BGE or Big Joe KJ. both 24" grills. With the BGE it was expensive but then I needed to add a stand, side tables and the plate setter stone. This drove the price up. with the KJ I paid about the same as the price of the egg but it included the nest, side tables, a divide and concur flexible cooking system with deflector stones, an x-rack accessory rack, ash pan, and bbq tools.
I prefer grilling to smoking. That is why I went with a ceramic. With the BGE the plate setter is a large one piece disk. It really does not set up for an easy to use 2 zone cooking system. With the KJ flexible cooking system, I can have a hot side and a cold side. I liked the versatility of the KJ more than the BGE.
Being a member of various kamado cooking sites, I saw the owner, Bobby Brennan constantly responding to peoples comments and providing his personal number and email if they had questions. He still does this to this date. His lead customer service worker Meghan reviews sites daily, answering warranty issues and helping where she can.
So many customers raved about the quick customer service and warrant support. I saw this regularly.
The warranties for BGE and KJ are very close. They are both lifetime on ceramics so you are covered. Where KJ wins out in my opinion is that you do not pay for shipping and handling with KJ. I had a warranty claim that cost me nothing. With BGE there are fees for replacement parts delivery.
The last reason... I hate green. I liked having the option to choose between black or red. KJ has since discontinued their black versions, however, the red with new black side tables and handle is so amazing to look at. Very nice looking cooker.
So that was my decision process, I wouldnt worry about resale because you will never get rid of it for one. And two the price goes down for both because warranties are not transferable so people are reluctant to take that chance and usually just buy new.
I also would suggest a big joe if you plan on one cooker. The larger area is worth it and with the KJ it comes with a divider to split the fire box for smaller cooks. Bigger in this case is better. And honestly once you start cooking on a ceramic you will be amazed with it. It will become your go to and your other cookers will get neglected. So having the space will prove effective!
good luck and again you really can not go wrong with either cooker, but for me I give the go to KJ