Having a 30th SR5 and a new Special 5H, they're definitely different flavors. The Special is much more rounded and smooth sounding. My Special, an aqua sparkle/ebony, is also the punchiest sounding SR5 I own. I've noticed that on the Special 5H, if I boost bass all the way up, boost the treble some, and cut mids, I can almost get the same tone of my 5HH with both pickups on. I can't get that tone from my '88 SR5 or the 30th, but both of those get different tones that the other basses can't quite get.
I haven't used anything but Elixir nickels on my StingRays and recently bought stainless that I put on my 30th SR5. I think the top is definitely there, but I love Elixir strings.