Saturday. I have a lot of out of town guests on my side and Saturday seemed like the best option for those having to travel. Also we just like Saturday weddings better in general and for our venue there was no price difference based on the day.
We are getting married on a Friday evening. We would've liked a Saturday but for a winter wedding it was all booked. We were able to get a discount with our day being on Friday which helped soften the blow. As far as I'm concerned most if not all of our guests can attend.
Monday! We only had 15 guests, mostly retired family members. Not was the wedding cheaper on a weekday but we thought some guests might want to play a few extra days in Napa and hotels are a lot cheaper for them during the week.