IMHO and I do not own one of your targeted models. So FWIW.
As both the models you mention will involve plugging them in and electronics I would visit every website possible and read owners reviews. Then based on the Warranty, customer service and overall reviews I would make a decision. Some of the reviews will be harsh, as you can't please some folks, but a pattern should emerge if you read enough.
Although I have no personal experience I have read many time on this forum where a welding blanket from Harbor Freight, Large insulated hot water tank wraps etc have been used to help skinny steel and in brutal weather conditions.
Good luck. Please post up when you make your decision-and why--cost, reviews, dealer etc.
Primo Oval XL, Pit Barrel Cooker, Tiernan SOB-24, Big Green Egg-Mini, Blackstone 28" Griddle
"you set it up so well, so carefully " Eagles
Last edited by 16Adams; 12-26-2013 at 08:23 AM..