Its about the same if you watch about 8 movies/ month.
Red Box is $1 each and Netflix is $8/ month so if thats the case it is the same price. i have Netflix and would say I watch it more for shows and
older movies. Because sometimes it takes FOREVER for a new movie to pop up on Netflix. But Red Box has new releases available to you right away. Netflix doesnt cease to keep me entertained though, there are amazing documentaries on there and great movies/ shows too that I hadnt heard of and begin watching. Or ill find ones I remember really wanting to see in theatres months ago but never got the chance and now I can.
Also like people have said, Red Box is due the next day (or +$1/day) and Nexflix is a set price and you can take your time.