From what I read, the Get More Plan has more allowable hot spot data (now 30gb), the discount for auto-pay is $10 per line instead of $5, more Cloud Storage and if you have a jetpack, it is only $10 for unlimited. I think you lose the pass for International data.
I never had unlimited until the latest plans. I found the newest plans to be a good price point per month and I went from 5GB premium to 25GB premium and Apple Music for the same amount each month. (3 lines on my plan, so I am still paying $55 for my line only.)
rempson did a great job with the highlights. An additional mention is that the Above Unlimited includes "5 TravelPass® days per month to use in more than 185 countries" while the Get More Unlimited does not.
These two links share the details of each: