I think Starwolf trilogy is great...
I agree. It's a really clean, tough series - much lower key than
The Star Kings, but really enjoyable. But I also love
The Star Kings and am apparently in the minority in finding the sequel pretty impressive - it's not equal to its original but, maybe because I wasn't expecting anything good from a book of stories tacked on to a novel separated by 25 years, it was better than I expected. I also like
Battle for the Stars and
City at World's End. Strangely, while he has some good individual stories, I like his stories less overall -
The Best of Edmond Hamilton and
What's It Like Out There and Other Stories are not great collections, overall, to me - though not bad, either.
And I finally,
finally, got
Crashing Suns and
Outside the Universe recently after having looked for them for years. Except for a few individual stories, I've basically only read from his 40s-60s stuff, while these (the Interstellar Patrol stories) are his big thing from the 30s. I look forward to reading them soon. (I want to right away, but I'm systematically working on the unread pile and, if I stick to it, they don't come up right away.)
Brackett is also very good but, unlike Kuttner and Moore, they never really collaborated, except on a Stark and the Star Kings crossover story. And apparently Hamilton revised (or maybe just "prepared") some of Brackett's stuff for book publication, like the first Stark duo. At least, that's how I understand it, though I could be wrong.