That's^ a very good point, but if you won't be trailering the car to the strip, or if you'll be driving it to any shows, cruise nights, or just romping around on the street once in awhile, then I'd have to say that the Detriot Locker would be the way to go since it's likely the most durable. There aren't any clutches, nor spider gears to wear out, and you can still negotiate turns w/out having to spin the tires through the turn, nor worry about breaking an axle like you might have to with a spool.
if the car won't see any street time at all though, then I agree..go spool