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TBH I doubt your 2012 Macbook will find the 50MB files from an A7III easy to handle, let alone the 100MB files from an A7IIIr if you work un-compressed. My 2009 Macbook couldn't handle 24MB files from my Nikon D610 very well.
The A7IIIr has a better EVF, better rear screen and allows more cropping IF the lens is up to it thus giving a bit more reach.
For most of us the A7III is the sweet spot for all-round shooting, though there are times when I'd like an R for landscape work.
The OP can always invest in a better computer later down the line.
In a digital photography workflow your camera and lens is only one part of the jigsaw. Your computer, your screen screen, screen calibration, editing room (I edit always in the dark) all form a part of the puzzle. Ideally specs wise I'd want the latest i9 or Xeons, probably 128gb minimum of RAM, several TB of storage (doesn't have to be onboard though) and windows/mac - not arsed as would run C1 pro. SSD would be essential for the boot drive but not for files. I have a back up strategy with offsite storage (god bless other family members) to store my back ups.
I'd love to upgrade to medium format digital - but the cost vs my circumstances just isn't there and I'd want to spend a big bundle to get the hardware to manage it all
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following the great advice you have all given so far, it really is helpful so thanks again! I like to be thorough but I think I now just need to make a decision 
