I... but will tell you why the Axis has more bite. No tone cap. Even with the tone knob turned all the way up, you have the cap in series with the pot. It's still going to have some minor affect. Now, Music Man used to make Custom Axis guitars with a tone knob also. If you like the sound of the supersport better, put a 500k and cap (I forget the value) across the pickup.
I prefer a locking trem and 3-way switches, so the Axis is for me. Nothing wrong with the ASS, same neck, same feel, I just don't care for sliders and don't need a tone knob. It comes down to what you like.
I have to disagree with the masses. I think there is enough of a tone difference that it should factor into your decision. True, they do have the same pickups, but the Axis simply has more bite. I have found that to be the case on both the Floyd Axis models and hardtails. My suspicion is that the lack of extra wiring adds more "umph" to the overall sound, enough to where super sports are no longer on my shopping list when browsing guitars. I have owned half a dozen super sports over the years. They are awesome guitars, don't get me wrong, but the extra bite sounds better to my ears.
My theory is that it's due to the Axis' lack of a tone circuit. Even when dimed, a regular tone control sends some treble to ground. As a result, the guitar without a tone control will sound brighter than one with a tone control. In the late 80s when PRS got some complaints about the "sweet switch" equipped guitars being too bright, they started adding a dummy tone control circuit to roll off some high end.Several forumites commented on the 'bite' that the Axis has over the Axis Super Sport. I bet it's possible to get a push-pull pot as your volume pot and bypass the five-way switch all together, having your pickup go straight to the output jack via volume. Does anyone have any thoughts on this?