Resort rates go up on Friday and Saturday nights. Sun-Thur are cheaper. If the flights are the same for sat or sun (or within a few dollars) you might save doing a Sun arrival. I have done both and I like the Sunday arrivals.
I agree with the Sun-Fri, I'm actually in the process of booking such a trip for myself during F&G. Room rates are less and since I drive it gives me a whole weekend to recover before work on Monday.