Dead shot +2 vs Composite Longbow +1

So for all you math geniuses out there - which is statisticly better for my level 5 elven archer -

Dead Shot +2 (Longbow of Marksmanship) Thac0 +3, Damage +2, Speed 5
(Currently = Thac0 3, damage 7-12 with normal arrows)

or

Composite Longbow +1 - Thac0 +2, Damage +3, Speed 6
(Currently = Thac0 4, damage 8-13 with normal arrows)