For just plain Birdseye cotton flats, I really love GMD. I have GMD, Diaper Rite, and OsoCozy.
I haven't tried hemp flats and I do have some Sbish bamboo flats, but they're more like prefolds. I'm sure receiving blankets would be thick but I haven't tried them as a diaper because the only ones we were gifted are embroidered with adD's name and I don't want them stained.
: MM Dragon's Lair (2) + trim (1) on Uruguay 3-ply
includes Green Line, RagaBabe, BBB, Joey Bunz and more.