The short answer is both because they give two different lighting effects!
The RoundFlash™ Ring is a collapsible ‘Ring Flash’ which can be mounted to your camera or used off camera with your speedlight for the awesome ring light look.
The RoundFlash™ Dish is a collapsible ‘Beauty Dish’ for use with an off camera speedlight and gives that wonderful studio beauty dish light.
RoundFlash™ gives you that studio look everywhere you go with & with our experts below you’ll soon be mixing it with daylight like a pro
“Turn your small flash into a donut of light that can give you a beautiful, shadowless look for key or fill” David Hobby – Strobist.com Gear List
You’ll be setup in seconds with this collapsible Ring Light / Softbox. It can be used on camera or off camera and works with most speedlights
Its almost unnoticeable weight of just 299g (11oz) & the lack of a power supply make the RoundFlash™ a must have for any camera bag.