Spheres are more predictable to the enemy, as no matter how you manuever the blasted thing, your profile in his targetting reticle wont change. Meaning all he has to do is point at any part of it and shoot, which wont be that hard. With a different design however, say a Thoth, when it rotates, its profile changes, and you have to make sure that you're still pointing at a part of it instead of open space. May not be so hard if it only manuevers every 5 seconds, but if you're playing a TVT, whoever's flying the Thoth wont be sitting still that long, they'll be manuevering constanty. A sphere is just not the best design ever for space combat , you even get better weapons coverage on a box.
