Deal 3-7 is where the course comes alive. It is even better with 3 off the forward tees as a brilliant tough par 4.
However I don't know of any stretch, anywhere, better than 15, 16 & 17. Its where the course shines most brillliantly.
Love the whole back 9 at North Berwick, but I'd choose 10 & 11 over 17 & 18.
Its a slight generalisation, but I tend to favour courses where the interest is towards the back end?