El Capitan works fine with Scrivener for me on a brand new 12" Macbook and a 2011 27" iMac. I’ve had no problems at all (apart from a minor cosmetic niggle with Quick Reference panels).
A few people have reported a few issues with getting it working initially, but as far as I know these are easily resolvable and may be due to updating to Ell Capitan, rather than a fresh installation. You shouldn’t have any problems with a new machine.
If you’re looking for a purely writing machine (or one that you don’t need to do large graphics manipulation on) then the new Macbook is an excellent laptop to have a look at. But try the keyboard first - I find it very good, but a few people have tried it and didn’t like it.
In my experience, Snow Leopard was the most stable OS X for everything (including Scrivener).
But if you’re going to update, go El Cap on a new (or near new) machine. All the sparkly bells and whistles and it may even last until Apple start naming their OS by astronomical bodies (I’m picturing Tim Cook, looking exactly how he looks now, proudly announcing OS X Charon…)
Scrivener works fine with El Cap in my experience on three different machines: a Mac Mini, a MBP 13" late 2012, and the new MacBook 12". Previous problems were due to public betas of the OS X, but they have all been resolved
What else are you running? Many many stability issues come from toxic interactions among applications, not from anything to do with Scrivener or the OS.
If you install an older version of OS X, make sure you have Apple’s last release version of it. 10.6.8 is very solid, but some of the earlier 10.6 releases were much less so. (This is also why I’m holding out for El Capitan’s first bug fix release.)
Scrivener is the main application I use along with Firefox and the Mail program, so don’t think I will create any toxic relationships between my programs on the new laptop. Knock on wood!
I plan to run Snow Leopard on my iMac until it dies, and after reading your input, I decided on a refurbed 13" rMBP. Comparing it to the MBA in the Apple store, the retina screen closed the deal for me, and my aging eyeballs.
OS X Charon? For some reason, just thinking about it gives me the heebie jeebies!
Since it’s almost Halloween, imagine if they went interstellar: OS X Betelgeuse! But for real heepbie jeebies, consider Microsoft adopting a similar astronomical naming convention. While Apple might introduce OS X Betelgeuse, Microsoft would proudly introduce Windows HR 2061*.
[size=50]For those who haven’t memorised* the Bright Star Catalogue, HR 2061 is another name for Betelgeuse (other names, from different cataloguing systems, include AlphaOri, SAO 113271, HD 39801, BD M+7 1005 &, of course, Hipp 27989. You never know what you’ll learn on any given day…
**I expect this includes anyone reading, or even likely to read (and probably even everyone who could read), this post[/size]
Just for the record! To all of you, peasants, off-topicing in this thread, less-culturally astute than my good self, “I’ve seen things you people wouldn’t believe,” Is Roy Batty’s statement to an incredulous Deckard. I wouldn’t dream of making such claims for myself … under the influence, or not. youtube.com/watch?v=HU7Ga7qTLDU
I’ll just take a few moments to compose myself after watching I always become emotional when I watch it.
Now y’ know … 'snot me, it’s Roy … OK? Gud