If you are planning on hanging a light on your HD weapon, the P30 would probably make more sense as it has the universal rail system. The USP series have accessory rails, but most lights/lasers will require an adapter to work. As far as reliability and dependability, I seriously doubt you will fire enough rounds in your lifetime to break either of them. Todd Green tested out a P30 with the intent to punish it and made it to 93,000+ rounds with minor issues. They are both built like tanks. My personal preference is for the P30 simply because of the ergos. The USPs feel a bit like a block of wood in my hand, while the P30 fits like a glove. It just makes for a more pleasurable shooting experience. Either way, though, you really can't go wrong. Good luck in your decision and welcome to the addiction.