I've owned both Mustang and Corbin over the years along with Ultimate seats. All were on different bikes and accomplished different things. They all make great seats that are comfortable for long hauls. It all depends on the ergonomics of the specific seat. Some maintain the stock seating positions, some move you lower, some move you back, some move you forward, etc.

So, which one will work for you just depends on what you want the seat to do for you. You can't go wrong with any of these brands. The Corbin seat did feel firmer than the Mustang and the Ultimate so I guess that should be a consideration if you prefer a softer feeling seat for your soft butt.