w/o going into the tech of each companies products i can say, reputation for one, ive heard all sorts of good things about infinity, and lots of bad things about the sonys. If you mean by "better", a product with more quality, then id say the infinitys have the xplods beat, in warranty, and history. If you mean by cost, the sonys are (should be) cheaper. Finally check out each ones Stats such as: RMS power handling, sensitivity, xmax etc. and see which is better. Basically to me it just comes down to personal opinion!!!! I personally know 3 people who have had 3 sony products fail (class D amps) and that means bad quality control to me. whereas my buddy just picked up a infinity 12, and its very good. Id pick the infinity because of experience.