[Twisted-Python] Is psycopg or pygresql better with twisted.enterprise?

[Nathan]

Is there any noticeable difference between psycopg (version 2) or
pygresql (version 3.8.1) when used with twisted.enterprise to connect
to postgresql?

Pygresql hasn't been updated since June 2006, but maybe that's just
because it's stable (?) -- I haven't used it at all, ever.

Psycopg2 has had more recent releases, but I've experience some bugs
with it in (non-twisted) threaded code and the web site has been down
for weeks (months?), so I thought it wise to explore alternatives...

Or is there a better third alternative???

Also, we're considering turning on SSL client-certificate verification
on our postgresql installation -- does anyone know whether either of
the above support SSL client certificates?

Opinions?

~ Nathan