I'm partial to the Armblades. Their ranged attack is so god damn POWERFUL and they attack fast so I can use Godfist into Rising Upper for some sweet aerial beatdowns.
Same here...any of the small/fast weapons are the best. The big slow weapons leave you open for damage way too much while the small & fast weapons stagger enemies like crazy and make incredible combos.
I honestly dont think there is any reason to go heavy/slow with the secondary. I prefer my Achidna's Fangs personally for the searing venom.