As a Glaswegian I won't attack you. However I would be interested to know what it is that makes you say skip Glasgow? Have you had a bad experience in the city or are you from Edinburgh originally?

Regarding the train journey, I would say the west coast route is far more scenic than the east coast and would take that unless delays are forecast. Cheap upgrades to First Class can be had especially at weekends and is well worth paying the extra for. As Jumbodriver suggested take the train/fly option. I would train it to Glasgow and fly back as the train gets quieter the further north you travel.