For me.... day of rest is Sunday.
On Saturday I clean up, go to the market, cook, prepare for Sunday Church and a whole lot more but on Sunday I just go to Church and have enough time to rest.
I think it depends on the individual, their work and their religious beliefs.. For me, I like on both days depending on my schedule for the weekend..
The answer really depends on which faith you ascribe to. And of course, if no religion is involved, then I suppose any day could be considered a day of rest if desired.
The Jews observed the Sabbath, or their day of rest, from sundown Friday night to sundown Saturday night. It was done so in keeping with the creation of the world, where God created the Earth and all things on it, including man, in six days, and rested on the seventh.
After Christ came, taught his gospel, and was crucified, the day of rest for Christians was moved to the first of the week, or Sunday, to recognize when Christ arose from the dead or was resurrected.
So, the observance of the rest day as far as religion goes really depends on your preference. There are others, like Seventh Day Adventists, who believe the Sabbath should still be Saturday.
My understanding is that at least in some countries, the Muslim religion has their holy day or day of rest on Fridays.
You can just rest when you want. There is not really a best day to do it. LOL
This I believe had caused a lot of controversies in Christianity today. It was written that as Christians, we should remember the sabbath day and keep it holy. The confusion lies in which is the sabbath day. The sabbath day is the last day of the week, the seventh day which is Saturday according to the calendar. In the account of creation, God worked for six days and rested on the seventh day (sabbath) and this has become a law. SO as Christians the day of rest is Saturday.