7mm, out of that list, obviously Yoder is at the top and then I would say the LG or GMG, Traeger is on the bottom of my list. I don't know anything about the Bull you mentioned.
MF- The RT 700 is $1199 US but you can still get the RT 680 as they are wanting to sell all them and replacing with the RT 700. You can get the 680 for $998. Even after converting to Cdn $ and getting it shipped here, they are just just much better quality than most brands up here. (Traeger, LG, GMG)
Im selling my 4 year old Rec Tec 680 and getting close to the price of a Traeger new. That speaks volumes on their quality and resale...
www.rectecgrills.com