I heard from the Chester organisers that the fiels is already 4 times bigger than last year which is good news, and I'm happy to run Chester.
Knowing both places it would be Chester all the way just a pity the Liverpool race was put on the same date, and answering your points
Cougie - Yes they will get my support, this year and next
PFS - Liverpool may not be as fast (can't claim that will affect my decision) but neither will it look as good
Treadmill - Yes if there was a two week gap I'd aim to do both as local marathons, and having had the experience I wouldn't work in Liverpool for a gold clock