Great question. My preference goes to 1 seed and (3) passphrases, I think that's the best option for the individual. Actual multisig is a bit overkill imo unless you're a company or a collective.
Discussion
You talking about separating funds across 3 different single sig wallets separated by pass phrases, or an actual 2/3 multisig?
Different single sig wallets (+ some decoys maybe). This is admittedly not as secure as multisig but it's enough for me to feel safe (for now) + a lot easier for inheritance purposes in case something were to happen to me suddenly.