Old model 357 flat top converted to 44 Spl, all steel grip frame and ejector housing:
OM Super Blackhawk barrel with eagle, cut to 4 5/8" with resoldered front sight.
USFA 44 Spl factory cylinder, (USFA out of business now).
Super Blackhawk wide trigger.
The advantage of Uberti/Colt (not early 3rd gen) style cylinders is the removable cylinder pin bushing which makes them easier to fit to your frame PLUS you can use the same cylinder in more than one gun by having different bushings to fit each gun.
Before fitting the bushing you’ll need to trim the rear ratchet surface of the star slighty to match the Ruger cylinder and frame. Just use your current Ruger cylinder for the measurement.
Lastly one thing to know but not to be concerned about
: the Uberti and Colt cylinders have slightly wider cylinder notches than Ruger because Ruger uses a skinnier cylinder stop bolt. However this is not an issue and needs no extra fitting. When the hammer is cocked the cylinder pawl locks the cylinder against the right side (deepest part of the notch) and holds it there while the gun fires.
Colt cylinders will work fine but they're .020" smaller in diameter than Ruger, so less strength. And they're expensive unless found used.
Uberti cylinders are the exact same diameter as Ruger mid frames. They have the nice large flutes and chamfered front edge like the old Colts, and they're a lot cheaper even brand new.