I've never flown Das Teutor and the only version of the Firefly I've flown was the T-67A. But here's what Greeners wrote about the T67M in the December 2011 edition of
FLYER:
Ah yes, the roll performance. I’d been warned that the Firefly has the slowest roll rate in NATO. Surely it couldn’t be that bad. Actually, it was; borderline glacial and if Firefly pilots become good at slow rolls, it is probably because it is extremely difficult to roll all the way around without substantial rudder input. Those massive glider wings present a substantial impediment to rolling, both in the horizontal and even more so in the vertical.
The T-67A had a dismal roll rate and it seems that the later versions weren't any better. Hence all rolling manoeuvres at air shows seemed to use flick entries rather than conventional aileron entries
You can read the article here:
http://www.swiftaircraft.com/SwiftAi...ER-Firefly.pdf