Since you're on 33s and likely headed bigger, do the transfer case or a doubler first. Changing differential gears can come later.
In an ideal world of unlimited cash, you would always match the gearing to the tires first, and the transfer case to how slow you want to go. But it's all a compromise.
Gearing the differentials is a 10-20% difference
Gearing the transfer case is an 85%-100% difference
Adding a compound reduction box like toy box or black box is a 300-400% difference.
Just pick what you need and what you can afford.
So you just need to decide how slow you need to go, for where you want to go. The Rubicon trail, rewards low gears, everything else being equal. Dusy Ershim or Fordyce even more so.
Let's talk more about this over a beer at Buck Island. Steve
@MountNGoat may have some ideas about this as well since he's the 33 inch trail expert.