Im in the uk, traditional cider/scrumpy, over here is brewed from a mix of apples, reds, greens and crab apple roughly mixed in 1/3rds the nicest tasting apple wine, or scrumpy however u want to name it, though, has a bit of a bias towards red apples, reds give a nicer, traditional dry flavour to apple wines in my opinion.
Based on that I would go 25% green 25% crab and 50% reds for a nice drinkable balance, in my opinion.
Also, worthy of note, is that apple tends to blend well with most other fruit wine, and in conjunction with grape, generally provides all trace nutrients required for a healthy ferment hence the apple and grape beverage industry.
Both, apple and grape have a lifes worth of fermenting to enjoy, hope u enjoy your journey ;-)
both crabs and greens tend to be overly acidic as well.