
Drumasonic 2 and Drumasonic Luxury Kontakt libraries - no expansion packs, a clean sound said to be interesting to people who know how to mix a drum kit. Steven Slate Drums 4 - has a few expansion packs. Superior Drummer 3 - SDX packs have about twice the amount of samples as EZX packs, 3 zone cymbals for new SDX, more natural sound compared to EZdrummer.
Abbey Road Drummer / Studio Drummer Kontakt libraries - 3 kits at most per library, 3 zone cymbals. BFD Eco - compatible with the BFD2 expansion packs but limited to 24 samples (48 for the snare) even if the pack contains more samples. DrumMicA Kontakt library - free, about as many samples per kit piece as BFD Eco/Abbey Road, 3 zone cymbals. Addictive Drums 2 - has expansion packs, not many samples, more natural sound. EZdrummer 2 - lots of expansion packs, not many samples, more processed sound.
Here's a list to get an idea about each VST: