A lot of people responding to this saying “why decimal, why not use an alphanumeric passcode?” Sure, go for it. But keep in mind that unless you choose your password very well you might not be *that* much better off.
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So in summary: random (long) numeric passcodes may be a more ergonomic choice for a given security level, especially if you force yourself to memorize the thing over a week or two (even if that involves carrying a post-it during that time.) But do whatever works for you.
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Honestly, this is why I still prefer a (rooted) Android phone where you can set a long FDE passphrase and a simpler unlock passphrase. If you shut the thing down the key material is gone unless you can crack a long scrypted passphrase.
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I understand the trade-offs Apple is making with their more complex security implementation (and Android is moving in that direction with file-based crypto) but I'd rather have a much simpler to analyze FDE approach.
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The problem with FDE iirc was that for the phone to operate, keys must be in memory (so that binaries can be decrypted). The file based approach allow cleartext keys for non-essential files to be wiped from memory when the device is locked and to be encrypted with the passcode*
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