iOS devices have had there tactile interaction down since the beginning. They are so responsive compared to Android devices (from my experience), and so I don't see where Apple could have improved in this area.
If the Galaxy Nexus is really on par with the iPhone (and I'm highly skeptical of that) then I might stick with Android for my next phone, but otherwise I have to go iPhone just based on touch characteristics alone.
EDIT:
http://androidandme.com/2010/03/news/is-multitouch-broken-on...
Quality daytime viewing, via LiquiVista (or similar)[1]; electrostatic haptic feedback for something better than a goddamn vibration [2].
1. http://www.youtube.com/watch?v=D6tzaIgZKs0 (LiquiVista) 2. http://www.youtube.com/watch?v=FiCqlYKRlAA (Senseg)
[1]: Although not to the extent of that Microsoft demo posted a week or two ago.