I believe the steel S&W in .38+P is the "Airweight." The scandium/titanium one in .357 is the "Airlite."
The Airlite feels like an empty water pistol when you pick it up. It has a certain amount of recoil. Yowsa, it do.
With the Airlight, I went through regular .38s, then .38 +P 125-gr bullets, then 158 gr regular 38s and stopped there. Yowsa, I did.
My son tried full-house .357s through it and said it felt like a jackhammer. The pointy end. Yowsa.