lockers will make a world of difference off road. as to style......its all in how you use it. obviously, selectable are great if you dont want to give up any road manners etc. i have a lunch box locker (aussie) in the rear of mine and it has decent road manners, but i dont ever drive in snow or ice.
swap your rear end for a 44 or ford 8.8 if you're planning to lock it.
'90 YJ, ford 8.8, SOA, lincoln front, aussie rear, 4.88s, swampers.