Before I got the GMG I had a Weber gas grill and Weber smoker. We moved and I upgraded my gas grill then replaced the Weber smoker with the GMG. Since then I've hardly used my new Weber gas grill. I'm actually thinking about selling it. Didn't think I'd ever consider that. It does sear steaks better but I've learned to reverse sear on the GMG and the steaks are as good if not better with the smoke at the beginning of cooking than searing first then slowing the cooking on a gas grill in my opinion.
You'll like the WiFi. I can keep an eye on the meat temp from my recliner and adjust the grill temp too if needed. I do have the blanket and can cook outside all winter when I choose to. Worked great today in the 20s on the Easter ham.
I keep mine in the garage so do not have a cover.
I have not noticed much difference with the different pellet flavors because all the pellet flavors are a blend with hardwood. There won't be as much flavor difference with the pellet grill as you'd have with an offset or other type chunk/log type smoker but the pellet grill is much more convenient to use and I have not screwed anything up yet. It just does a great job of cooking. From everything I've read, slow cooking meats is healthier for you than high heat grilling too.
Even though I have a GMG I get most of my recipes from Traeger's website because they have so many posted there with pictures and easy to follow directions.
Hope this helps. Good luck.