My biggest thing with traeger is just the convenience. I literally feel like I’m cheating when I cook my food. The wifire capabilities and recipes on the app are stupid easy to use/follow. I started smoking meat about 2 years ago on a big green egg and was so frustrated with trying to control the temp. In just a few months with my traeger I am killing ribs, pork butt, and brisket. I would say if you are new to the smoker game traeger is the way to go. I live close to work and have the freedom of coming and going so when my traeger app alerts me that my internal temp of whatever I’m smoking is where I want it and I can run home and wrap it or even set it to warm from the app if I can’t get home makes things super easy. In reference to your question about traeger models I feel like the biggest difference I see in the timberline compared to the ironwoods and other models is the double insulated walls in the grill. For me that was huge because I live in Illinois and one day it can be -50 and the next day it can be 83. This grill holds temp like a beast in the winter no problem. Luckily for me my grill is inside on a screened in porch so it’s sort of protected from wind and weather but I truly believe I’d see more temp fluctuations if it wasn’t for the timberline design. Hope that helps.