Can someone please explain to me (quite a noob) what the main advantages of having the HTC source code are? In layman's terms. I know there are really great roms out there, so what will this source code offer? And will it also concern the AOSP roms? Thanks!!

Can someone please explain to me (quite a noob) what the main advantages of having the HTC source code are? In layman's terms. I know there are really great roms out there, so what will this source code offer? And will it also concern the AOSP roms? Thanks!!