I guess you say that they're pretty even. You have more control over green shells, which allows you to make creative plays (hitting items, bouncing off walls to hit people, sniping people at your own choice), but more control can lead to more mistakes. The red shells offer less control and less plays, but makes aiming for someone much easier.
I'd have to go with red shells though because they are great for trolling and getting certain people right out of your way.
I'd have to go with red shells though because they are great for trolling and getting certain people right out of your way.