How does a Social Recovery Wallet differ from Shamir backup?

I'll try and take a first stab, but feel free to correct me.

Social recovery wallets

• are smart contract based
• Specific to two providers- argent and loop ring
• Involve splitting your private key into pieces and shared with guardians. Consensus of guardians can re-give you access

Shamir backup

• Can be used with hardware wallets
• Splits your private key into multiple shards, accessed through multiple recovery phrases. Having a majority of the shards will give you access

They sound very similar but I am not certain of the specific risk factors between each.

Edit: private keys, not public