zksnarks technology is pretty sweet (inherited from ZEC) but KMD adds an additional layer of privacy with JUMBLR (basically takes a T-address to Z, Z-to-Z, and then Z back to T). That's not to say you couldn't already do this yourself but it is already layered into the wallet.
KMD is the most advanced privacy coin in the crypto space, not only does it use the best tech with zksnarks, but with JUMBLR there is an additional layer, plus you can use BarterDEX for trading that avoids any centralised exchange kyc, so you can trade anonymously too. There isn't much point to anon tech if you hand over your passport selfie when you want to trade your anon coins!
I have always been a fan of XMR but unless they get listed on some decentralised exchanges soon the usability of monero will rapidly decline as more centralised exchanges ban anon coins.