selectable Dana 30 locker
Watch this and it will help you get an idea of what you want and what trade-offs you are willing to compromise.
***Example only, not an in-depth review/recommendation***
ARB is most likely going to be your #1 recommended locker based on the instant "lock" it provides (and the name). However, as explained tin the video, you still need access to air (extra $$) and it is one more thing to go wrong.
OX cable shift seems fool proof, yet, you need to keep the cable adjusted correctly. Many do not like the mounting location for the locking mechanism.
Eaton E-lockers are not instant lock and require a little wheel spin to "lock" into place, if you go in reverse, it unlocks and locks again as the rollers catch. However, if wired and protected correctly, it is typically worry free.
Get what I'm saying about trade-offs? Anyone can say "buy this" but you need to know what you are willing to live with.