I would have to say Star Shine. It is much funner than line rider. But you should make Star Shine comparisons or something that are the same like everyone said.
Yeah... erm. Well, I'm not a big fan of either of them, Line Rider can get quite boring and i find Star Shine very hard. This are quite different genres, but i can see some things alike, the fact that they are both very popular for their customization systems.
Well... I'm actually not so sure about which too choose, but I am sure that both games are quite original and innovative. But i guess Starshine because of it's better graphics.