Originally Posted by
SimpleManToo
[Moderator edit.] I have done extensive research and now am trying to boil down to some specific from people who have visited both locations
Then you should have started by asking some specific questions. "Has anyone been to the Prado or the Gulbenkien? are they worth a couple of hours visit? What were the highlights you would suggest people saw" "Is an excursion to the Alhambra feasible from Madrid"
The Spanish and Portuguese rail system have websites so you canlook at the route maps and plan trips - easily researched
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So you can learn this would be the beginning before or after the end of High Season for Travel)
Again these are quite vague concepts. For some destinations it is always 'high season' for visitor numbers and not related to weather.
People are trying to help you but please ask specific questions and don't be rude when people ask you to provide more information.