Ok, I forgot I brought my old dinc with me and it does appear to show the signal level even though it's not activated, cool!
All reading are taken in the same locations of the same house (that I like to call faradayville, see
this post for why (thanks BlueBiker!

).
- inside the front of the house by a large (like 10'x5' window)
* dinc: -93 dBm, 0 asu
* gnex: -93 dBm, 2asu
- just outside on front porch:
* dinc: -82 dBm, 0 asu
* gnex: -83 dBm, 2 asu
- kitchen (near back of the house):
* dinc: -90 dBm, 0 asu
* gnex: -93 dBm, 2 asu
- just outside on back porch:
* dinc: -88 dBm, 0 asu (flipped between -88 and -83)
* gnex: -93 dBm, 2 asu <-> -83 dBm, 4 asu (started out at 93, but settled in at -83)
- out front on side walk:
* dinc: -83 dBm, 0 asu
* gnex: -83 dBm, 4 asu
Looks like the two are quite comparable, at least here. I don't know why my phone was losing 3G along my drive today while my wife's iPhone 4 had a 3G connection, though

I have no idea if the dinc 3G radio is any good, though. Do all 3G-only phones not report asu? Or just some radios?
But at least for me on 3G it should be a similar experience to my dinc if these numbers hold true for other locations. As lame as it sounds, I may take my dinc with my out and about tomorrow and periodically compare it to my nexus.
I wish I could perform the same experiment with the Rezound or Razr, but even if I had one of those since gingerbread reports 3G dBm/asu and not LTE, I wouldn't be able to do the side-by-side comparison.