What are the benefits of curl bars?

Curl bars are lightweight and have a jagged shape, which allows you to grip the bar in an underhand, natural position to avoid discomfort.

Should I choose a curl bar or super curl bar?

Both bars are designed to reduce wrist stress and promote comfort, but, with the parallel grip used on a super curl bar, it can isolate and work the biceps better.

What are the advantages of straight bars?

You can use an overhand or underhand grip with straight bars, and it's better for chest and leg exercises than curl bars.