We plan to spend 3 nights and 2days in Porto.
Is day trip to Douro Valley in second week of November worth it?
OR is it worth to make trip to Evora on our way to Lisbon from Porto?
We spent similiar time in Porto and found the day trip in the Douro a highlight. We had a car. We also spent the night in Evora on our way to Lisbon and found it worthwhile.
What transportation will you be using? We had a car, that we picked up in Porto and dropped off in Lisbon. The Douro was a highlight of our trip. We also went to Evora and enjoyed it. It isn't "direct" from Porto to Lisbon, but worth the extra time.
Look at this trip report by Carolyn who was there in November last year.