What is the difference?

General
1

MATCH (m:Movie {title: 'Get Out'})
SET m.tagline = 'Gripping, scary, witty and timely!',
m.released = 2017

vs

MATCH (m:Movie {title: 'Get Out'})
SET m.tagline = 'Gripping, scary, witty and timely!'
SET m.released = 2017

2

There's no difference here, they will both do the same thing. I would choose the first option because it is more succinct