Choosing a seat at the Mannheim Rosengartenarena?

Hello,

I would like to reserve two seats for a comedian performance in Mannheim, at the Rosengarten Arena. It's supposed to be a surprise for my parents.

However, I'm a little unsure about the choice.

Available are:

• Center Parquet, Row 29, Seat 18, Entrance D

• Balcony left, Row 17, Seat 9, Entrance C

Does anyone here have experience and could give me some advice? I'm mainly concerned with the performer's good view.

I've already noticed that in the middle, starting from row 20, there are already gradations in height.

Many thanks to all

and love greetings