I've been using your thread, and other sites, researching the exact same thing! My conclusions are:
Sens tend to be the most active, easy to find, and inexpensive, but the coloration is bland. The albino is an option and marginally more in price.
Dels are slightly less active on average, at least twice as expensive, but much more striking in appearance.
Palmas are my favorite as they still have that "snake" look but don't get too big like the ornates, endlis, and laps.
(These are generalizations and behavior and size always vary within the species of course)
All these posts and there's not many people with the mind to give a fish more room than is barely minimal!!!
As the quote says, Endli and Ornate are far too big when fully grown for anything under 180 or there abouts!! My tank is 60" 24" 24" And it'll still be to small for my Ornate and my Laps when they get towards full grown..
But elieve be that i will upgrade due to the polys and the sevs that i keep.
If you want color then get a Delhize, for activeness the get a Senegal or palmas but don't get a fish that will end up cramped and unable to turn around..