Discone
I have the RS Discone as well. I am very happy with it.
When I wanted to purchase an outdoor antenna, it came down to either ordering something online, paying for shipping, and waiting for it to arrive - or just drive a mile away and bring it back home with me. I already had the mast, coax and other hardware; so I was anxious to get it installed.
I've not had "hands on" with the Diamond unit, but I have no doubt it is more rugged. Functionally the specs are the same.