For the rough stuff and gusty winds, you need adequate beam for
stability -- like 24" minimum. A stubby boat can be rowed faster than
a sleek one in rough conditions because you can get your back into it
on almost every stroke.
Your size makes a big difference, however. A 140 lb. person who is
5'6" tall will find the rec boats much more stable than one who is 230
lbs. and 6'3". And don't be confused by people who talk about rowing
in big seas; swell is not the same as chop. A 10' swell is easier to
row than a 1' chop.
On the other hand, if you row open water and your winds are usually
less than 8 mph, then either of these boats are good performers.
As a practical matter, I have found that as beam increases from 10"
(racing shell) to 13" (24 footer) to 18" (22 footer), the degree of
roughness at which you must abandon good form (swing, full
compression, recovery in the air) goes up, but not by all that much.
The major advantage of the rec boats is that they generally will not
capsize as long as you don't let go of the oars. You can scramble
along but it does not resemble or feel like flat water rowing. A
principal advantage is that you can row to calm waters that would
otherwise be inaccessible.
Ken
But, for all around fitness. you cannot beat the Aero. I had it out two
days this week in a foot and a half and it was rowable.
Among other boats, I have a Vancouver 21 (the forerunner of the Aero
with the same hull) and I almost never use it. Rather, I use my 24
footer (Peinert) until it gets too rough and then I switch to an Alden
Double (tricked out with stiffening cables, raised seat, CII oarlocks
and CIII hatchets), which I row until there is a small craft advisory.
Ken