LEDs are generally very directional, it's the optics that surround them that spread the light over a greater angle. i'd suggest the LD100 as suggested above because it's pretty much as close to omnidirectional as you'll get.

having two rows will hardly effect the light spread at all. it's very directional, i've compared it to my mars 3.0 and it's got better intensity and penetration but the same or less spread.