Portugal or Switzerland in October?

My fiancé and I will be having our honeymoon in late October and are trying to decide between Portugal (Porto/Douro Valley) or Switzerland (Interlaken). We only have about 6 days to explore. We love nature, trying new food, and history. I've found some negatives to both such as super pricey food for Switzerland and read Portugal airline isn't the best (cheapest option in our budget).

Would love to hear any thoughts!