I'm thinking compare a BGE to a Primo and and Kamado.
Compare the WSM to one of those Brinkmann bullet things (that are trash).
Otherwise, the best answer is both, but if you only get 1, get the largest BGE you can get.
Hance - Lake Dogs Cooking Team - MiM/MBN/GBA CBJ and comp cook
Lake Sinclair, GA (strategically about an hour from everywhere)