Difference between bows

Can anyone tell me if there's a big difference between using a Dual String Bow or the Widowhail?

I imagine a 250% Widowhail with a very strong quiver will outperform a high roll Dual String unless that one extra projectile makes all the difference.

For reference the quiver i'm using right now has:

10% increased attack speed
10 to 13 cold damage to attacks
1 to 27 lightning damage to attacks
29% increased projectile speed
+2 to level of all projectile skills
+25 dex
9 mana on kill

Those stats are buffed by 320% thanks to my Widowhail and passives, and i really just can't figure out if a Dual String would be better than said Widowhail.
(I'm still fairly new to POE.)

Thanks for your answers in advance!

Best bet is to find a dual string with better stats because the second arrow (and subsequently, additional arrows after that if you roll them) increasing your dps by 100% each or something like that, sim it for best results.