I view the DW "small" frame as being a "medium" frame as it is the size of a S&W K frame or a tad larger. It's not really oversized for the 357 Magnum chambering, where as the DW large frame is definitely bigger than a S&W N frame, it's built like a brick outhouse, as big as a Redhawk if not bigger. Really the best DA frame around for the magnum and SuperMag chamberings.
The DW large frame is stronger than a S&W, better looking than a redhawk, and more accurate than either. It's heavy to tote, but as mentioned above, it's a pussy cat for recoil. I just ran an experiment that involved running 120 factory loads through my 44 Mag DW in one session and I was ready for more. With a S&W 44 the recoil will make you toss in the towel before you get to 120 rounds in one session. Can't say about this for the Redhawk. I once had one but did not like the looks, ergonomics, or the strange noises it made while cocking it. Although the Redhawk is said to be about as hard to break as the DW.