Which one? (Be helpful if you had pros and cons with your answer)

[robotchibi]

So we have to ideas for herding and we're having a lot of trouble deciding the first one is: two arms are going to come down (cause in the beginning they stand up right in the front of the robot) and are diagonal facing out on the right side is a little extra piece facing in slightly so that when it goes around the ball it holds it in so it doesn't leave. The ball is still able to role but in a confined area. The other idea is: something that we attach to the bumper's corners like long plastic materials so that when the ball hits it will hit it more on the "equator" the at the bottom where a regular robot will hit the ball.

Thank you to anyone who answers this it will really be helpful
And sorry if you don't get it or it's to long -.-'