> A. What is the difference in terms of which is best for security.

None.

Both are supported because some users are constrained by regulations to
use one algorithm or another, or because their smartcard supports one
but not the other, or... etc.

> B. My Key signs SHA1, I have noted others have SHA256 and SHA 512,
> how can I select that when generating a key.

This is a GnuPG configuration setting, not an Enigmail setting.  Edit
your gpg.conf file and add the line:

personal-digest-preferences SHA256 RIPEMD160

GnuPG will use SHA256 if possible, RIPEMD160 if a 160-bit hash is
needed, and SHA-1 only as a last ditch fallback.

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