Can't speak for Sutliff, but I shared some LJP Tashkent with Jeremy Reeves from C&D at the Muletown Pipe Show last year and he told me that Peretti purchased some of their component tobaccos from them. It's definitely odd that I MUCH prefer Oriental #40/Tashkent by LJP FAR more than any of the Oriental offerings from C&D (though Sunset Harbor flake is a treasure).
This is a pretty amazing interview if you like LJP blends. Steve Willett (current owner of LJP) does talk about how Sutliff processes tobacco for
some of their blends.
Back on topic, there's plenty of Sutliff blends I like to smoke. Match Ready Rubbed, Match 20, Match OBS, Match Revelation, Match Elizabethan, Match Troost, TS-20 Perique, 1849 (underrated VaPer), 507-S, TS19/20, VA Slices, Aged Maduro Cavendish, Maple Shadows. I'm sure there's more I'm missing.
There's also blends Sutliff produces under other brand names that I like to smoke, like John Cottons Double Pressed VA, H&H Anniversary Cake, H&H First Snow, Bright Night, Smoky Mountain, White Knight, Fusilier's Ration, SPC Hogshead, Plum Pudding
There's also tobaccos they process for B&Ms like Watch City Cigar, LJ Peretti and McCranies. Not sure about the others like Country Squire, Uhles and Wilke but I bet they're getting tobaccos from them as well. Pretty sure all the name brand Iwan Ries stuff is all made by Sutliff.
So yeah, fair to say Sutliff makes some quality stuff and they make a TON of blends so theres something for everyone I feel like, Same with C&D. C&D makes A LOT of blends I don't like but a few that I can't live without.