When you drive with a locker for a while, you'll know how easily it locks.
I personally prefer a locker in snow versus limited slip or open diff. With an open or limited slip, THAT it when you don't know if one tire will spin or both will. With a locker you know what you are going to get. It is so much more predictable. Get on the throttle and it's going to lock. Yes it could cause you to slip but anyone who has a clue about countersteering won't care, and being careful with the throttle will prevent sliding.
2006 F150 FX4 Super Crew - Bilstien 5100s leveled 2", 35" KM2s, 4.56 gears, Detroit locker, Eaton E-Locker, Traction Bars, AEM intake, Xcal 2
2010 VW Golf TDI 6MT