Wasabi makes it harder to spy on your balance and payments by rotating addresses, doesn't disclose information to peers on the network when receiving or sending a payment, it's compatible with Tor.
Samourai will alert you if you have sent to an address before, provides, by default, a transaction that increases the difficulty of linking inputs to outputs of a transaction, making clustering wallet addresses and associated metadata more difficult, makes transactions more complicated to analyze, it's Tor and VPN enabled.