This is a personal matter.
My BBQ area has limited space, I need to keep it flexable. I choose an OTG and got 2 small side tables which I can move around and use with my WSMs as well. I like my 22 1/2" OTG so much, I just got a 26 3/4" one too. :razz:
I use a high output propane torch to light the charcoal in my WSM, it works just as good in my OTG.
On a short smoke, with a small amount of food, kettles are great.
On a longer smoke, WSMs are better due to their fuel and grate capacity.