Personally, I prefer NowTV because I can use it on any device I like without having to rent hardware from Sky to do it. The ability to pay on a month to month basis is also a big factor for me because I work away from home and some months cancel it altogether as I do with Netflix etc.
What I really can't understand is why anyone would even contemplate Sky Glass.
That was my question too. I understand why people choose now TV, but no idea why, if someone was considering SKY TV, why they would turn down Sky Q and go with Stream/Glass