Between those two, I'd pick Sarge hands-down, but I'm not a fan of High Velocity at all. Entirely too loud for my tastes. If you're going Rubicon, Sarge would also look better (IMO) with either the red dash/black leather or the grey dash/brown leather options.
My hydro is also too loud for my tastes, but it was the best blue they had at the time (and I've grown to like it).
I guess my only advice is to make sure if you go for a bold statement that your bold statement is something you like for as long as you plan to own the Jeep. On the flip side, you don't want to play something safe and regret not going with your heart because you played it safe. Personally - I'm a fan of Sarge.