I don't know too much about border wallets. My understanding is that it works like a 2-of-2 scheme where you need both the word grid and the pattern (memorized) to recover the seed.

In many respects it functions similarly to a seed + passphrase setup. But I think that the border wallet might make some trade-offs for improving accessibility at the expense of security, and that it's an "emergency use" sort of thing that shouldn't be considered as a long-term solution.

I'm not sure what a border wallet gives you over a seed + passphrase in this circumstance. Passphrases are commonly used, so I'd wager that their risks and mitigations are more thoroughly understood.