Different cookers excel at different things...I am a little different than most here in that I am not into a backyard full of grills, so I tend to have a couple cookers at a time and see how they work for me and go from there.
I had ceramic kamados for years and years and enjoyed them as they were low maintenance and produced good results (still have a few small ones in the shed). I have had several WSM's over the years and while they work fine, they were not for me. I prefer a kettle to a WSM as its far more versatile imo. Had a Stumps gravity feed for a few years and that really took my que to another level...can have light or heavy smoke profile....depending on how much wood you use...very easy to over smoke something though IMO...but they are hands off and rock steady on temps.
Did pellets for a few years and they are really hands off and produce great food...although with a lighter smoke profile...extremely versatile cookers and great for quick cooks.
Finally, the stick burners - have had a few of them and in my early years, I didnt practice good fire management..I would load up the firebox with wood and try and get an hour or 2 of unattended time on my cooks...the complete wrong thing to do and my que was heavy on smoke and not real good...now I run a small, hot fire and dont worry about temps..if the cooker runs at 300-325, that's where I cook...smoke profile can be as heavy or as light as you want it on a stick burner....depending on the wood you use and the kind of fire you run. IMO, a well run stick burner gives you the absolute best flavor and end result for most bbq meats....a lot more work, but worth it imo...I can also cook hot and fast and get better results than i could cooking low and slow with a pellet cooker or Gravity feed, etc. I do like some things better over a charcoal fire like others have mentioned however...so if a person had a kettle and an offset, you would be pretty much set for most anything IMO (along with a griddle)
Also, make sure you can get wood easily for a stickburner...I am on the east coast, so Oak and Hickory are everywhere here...stick burners are made to burn logs...not charcoal...then of course you need to stack it and store it, etc, etc....good stuff