Both very nice guns. I'm particularly partial to the lowback. The .38 was actually fairly common in the fixed sight Speed and Service Sixes because they were marketed to LE and many agencies at the time had restrictions due to the .357 being politically considered to be "excessive force". That was also the era when the 9mm auto was being adopted and by the time the .357 was more readily accepted in more jurisdictions, the autos had a very strong foothold on LE and the revolver's days as a duty weapon were waning.