T31 v T21
One had a 'trip' in the 31 and a 'ride' in the 21.
In practice the 31 did all the hard work (in all weathers) and the 21 was reserved for 'nice days' with plenty of helpers,and only really earned its keep when AE flying was tasked.
The real worry was getting caught out on the field if a line squall came through,and not having enough bods to festoon on it (plus a couple in the cockpit holding the spoilers out).
You only had to see a 21 on its back once to make you sure the conditions were very 'secure' to drag it out in the future.