Rear Differential

Am getting ready to rebuild a GM 12 bolt. Wanna get more traction. Looking at either a locker or spool. spools are a lot cheaper than lockers truck won't be a daily driver. Occasional trail/mud and truck pulls. Maybe a little cruising around town.
Anybody have any experiences with a spool around town? Is it worth the money to buy the locker instead?
Thank You!
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