It might be a bit of a race to 30 between the Meatbox and an A-4D Scooter,but i would suggest the Scooter would win.Appx 5 vs 5.5 mins. For the other Performance ,ie turning ,you have to look at wing loading, power/weight ,configuration(drag factors),roll rates,`G`limits,etc.In the end that will boil down to the `lift boundary` and specific excess-power,at whatever height.
Further reading at,
www.aviation.org.uk-docs-flighttest.CH6, will enlighten you further,once you get past the `flute music`(equations).Enjoy..!!