Both, for different reasons.
Colored balloons are quite beautiful (especially pastel colors).
However clear balloons are both more durable and more risky/exciting.
I've got that kit as well. It's pretty nice.
Also got the original Exia and the Exia Repair II.
As well as the Astraea and Astraea Type F (The Astraeas are modified Exias).
Probably gonna get the Exia Avalanche Dash sometime soon.