I own and play both. I think my SG and Jazz Bass are top jack, while my other basses are side jack.
There's a distinction of side jack, too. I prefer the Thunderbird implementation where the cord goes along the direction of the neck. The Steinberger Spirit style puts the cord perpendicular to the neck, and digs into my thigh when playing seated.
There's a distinction of side jack, too. I prefer the Thunderbird implementation where the cord goes along the direction of the neck. The Steinberger Spirit style puts the cord perpendicular to the neck, and digs into my thigh when playing seated.