Doesn't matter. But if you jack up one front wheel, one rear wheel, and put the T case in neutral, and handbrake off, you can rotate the drive shafts so you can get to all the zerks
For the Uni joints, I pump in grease until it pushes out clean grease around all four seals.
Cheap uni joints with soft rubber cap seal will probably let all the grease blow past one seal, which means there's no way to be sure still for bearings on the spider have gotten a fresh load of grease...
When I changed noisy uni joints in my first new to me cruiser, needle rollers had been reduced to pulverised iron granules. Barely a full needle left in a couple of the cups.
Front wheel bearings where the same, which I discovered a few weeks into ownership after one had a total collapse and...