I've had an Austin XL for almost a year. Although it has put out some good food, I kept thinking that I would have enjoyed a vertical more. Since I also have a Weber Genesis gas grill, I can use that for more traditional grilling and use the Pit Boss just for smoking.
As with most people on this forum, I realized the shortcomings of the pellet grill and I wanted more smoke flavor, so I bought a smoke tube to supplement. But I was reading that verticals provide a better smoke flavor naturally, although I'm not sure why. It uses the same technology and same fuel. Maybe the design of the vertical allows for better smoke penetration? I don't know.
I also assume that a vertical is going to have more consistent temperatures side-to-side than a horizontal, considering the mods some of us have made to the factory design to overcome hot spots and temp swings. I don't hear about the vertical owners having to do anything.
A couple of months ago, I used the sear feature for the first time on a rack of lamb that I reverse seared. It was great. Then I reverse seared some smoked pork chops a couple of weeks ago. Now I really like that feature and I'm not sure if I still want to swap mine out for a vertical.
For now, I'm happy with what I have. I still I would prefer a vertical for ribs, brisket, and pulled pork, but since I don't smoke all that often, I can't justify another grill on my patio.
I would also like the footprint size of the vertical better than my beast. It takes up a lot of real estate.
Sorry for the length of the post. I feel like you asked my 2 cents, and I gave you a nickel.