This is a personal preference. The pullover is true turtleneck/rollneck (depending on where you are from), so that's a style/fit thing only you can speak to. The full zip can serve almost as a jacket thanks to its, wait for it...full zip. You can also have a little more flexibility w/ the neck choosing to either zip all the way up, or have it lay like almost like a collar. Also, some people tend to really look good in turtlenecks and others look, well, dorky. That one's on you, too. Or on us, if you post a pic.
I have the full zip. I love it. I have a Stark. I love that one too.