I left my pile of bricks outside so I can't throw them at anyone

My rule of thumb, as decreed by something I read a few years ago(plus my own idea for safety) - if it is a standard, non electronic car, either negative or positive will do fine. If it's a newer car or has lots of electronics, the best way to disconnect is via the positive side. I do the positive side regardless plus my car - it has a fair amount of electronics, i.e.full MSD ignition and all of my gauges. And yes, I do have a separate 50 amp maxi-fused 10awg line to an individually fused module for those items I don't want to shut off with the master switch which so far, it's the stereo(5 amps) and the trunk lift(10 amps) with the solenoid operated doors to eventually follow - (maybe).