In my opinion, it is better to oversize your grill. Cold temp and wind can suck away the we BTUs. You can end up with baked beans. No so tasty! I bought a Members Mark 5 burner grill at Sams Club several years ago. It has gone through hurricane Harvey flood waters and still looks top notch. Not a spec of rust. Today I did two three pound roasts in 90 F 0 wind weather. She held temp 520 F with two burners set to low and one modulated between medium and low. In 50 F 20 mph winter conditions I have used all five burners but not at full power. I always use five burners on high to preheat the grill to 600 F before loading the beans.
All in all I love the quality and kick assness of the $300 grill. Highly recommended. Sam’s Club still sells the same grill at the same price.