Recommended stock account organization?

[jim@kalafut.net]

I'm finally getting my arms around the idea of creating "Stock" accounts for
each commodity, but I'm not quite sure where these accounts should reside or
how many to have.  If I have a brokerage account and a 401(k) and both
contain shares of XYZ, do I create two Stock accounts, one under each, both
pointing to XYZ, or do I have just one XYZ account somewhere else?  The
former is more precise, but the latter seems a bit easier.  What are the
implications of each way wrt. reports, graphs, etc?

Thanks,
jim

P.S.  I noticed that for the default accounts gnucash broke out a 'stocks'
account separately under both 'brokerage' and 'retirement', so I think the
split approach is recommended.