i've not done the puerto madryn, which sounds excellent. But I did my inital scuba training and first year or two of diving all in Alaska. I did it all drysuit, though others used thick wetsuits. Was a great way to learn, and a unique place to dive and see. I fondly recall the first real dive, where it was snowing, gray, miserable, and with the drysuit and insulation I needed about 45lbs on my belt plus 4 lbs per ankle, so i'm sweating, damn uncomfortable, feeling like a beached whale, wondering why i'm doing this, and then I backed into the water and voila, of course it all changed.... awesome. Now weightless, "cool" (no longer hot from the suit, nor freezing from the water), with Sea lions, schools of black cod, wrecked boats and airplanes, etc. Getting that drysuit dialed in was key. took some time and focus to get it just right... not so tight on the seals that its painful, but tight enough to not leak.
did some mixed gas diving too.