If I was to pick a day of the week that's my favorite I'd go with Saturday.
I love the potential of a Saturday. It comes after the pressure and ease alike of a Friday. It allows you time for catch up-be it sleep, visiting with family, or completing projects around the house or office. Saturday evenings are also nice to either get into bed early to veg out or get dolled up to go out. The possibilities are endless!
Maybe it goes back to being a 90s kid watching the TGIF line up every week. I got stay up later that night to do so, we had pizza, and quite often I had a friend staying over. Saturday back then offered so much potential as well. Hands down, Saturdays are the jam.