Depends on how you define "this era." In the end of the run, some of the Hawkman covers are pretty great (lots of Kubert and some by other artists). But, across the entire run, I'd say the Sheldon Maldoff stuff is even more desirable (throwing out a few scarce issues in the end - driven more by rarity than Kubert).
For instance, Flash Comics 33 (like this one -- Flash Comics 33 copy on ComicLink) is fantastic. Hawkman...but Shelly.
I was thinking of the 1945- early 47 era when the covers mostly alternated between Kubet's Hawkman and Hibbard's Flash, but I agree some of the Moldoff covers are excellent. Later on with Infantino and even Kubert himself doing the Flash covers they improved IMHO. I'm not much of a Hibbard fan, and I really don't care for Nydell's Flash covers, so I've always been partial to the Hawkman covers, Kubert especially.
Does anyone like Kinstler's Hawkman?