Shingen spear. Bow doesn't guarantee you your FB until MEX comes in, and even then with spear you can insta FB while with bow you still need to wait 1t, plus spear is atk.
On whether Herc or Shingen... depends on what the rest of your team is. If Ares Svarog Uriel are all there, Shingen probably. Otherwise, Herc. Also, Herc if you find your team a bit too squishy for your own liking.
Edit response to unregistered:
Debuff cap... on fire. Really. While all the hardest wind content is debuff resistant. Really now.