[gentoo-user] Useflags for wget and curl: openssl versus gnutls?

[walt]

A recent buglet in the wget package made me aware that openssl competes
with gnutls in certain ways.  Even nss and libssh2 may be competing in
the same space, if maybe to a smaller extent.

Anyone here really understand the tradeoffs involved in the use of these
useflags, and why I might want to choose one over the other?  Actually ATM
I have all four of those useflags enabled and I really don't understand
the potential consequences of my choices, which makes me worry just a bit.

Any clues much appreciated.