OK, folks... I have them both in hand, on different lines.
If there's anything you want me to check, I'll be happy to do so over the next day or two, so let me know. Here's what I've found so far; a couple of surprises:
1.) FM Radio - does NOT work on either the Verizon version or the Unlocked version.
2.) Wifi Calling - Yes, Verizon - No, Unlocked
3.) Advanced Calling Feature - HD Voice - Yes, Verizon - Yes, Unlocked
4.) Advanced Calling Feature - Video - Yes, Verizon - No, Unlocked (did not expect that one - no video calling is a big bummer for me...)
5.) Google In Apps Search Shortcut - No, Verizon - Yes, Unlocked (and it is awesome enough to almost warrant keeping this phone just for this one thing!)
6.) Smart Settings / My Places - No, Verizon - Yes, Unlocked
7.) Verizon Bloatware - Yes, Verizon, but can be disabled - No, Unlocked
8.) Wireless Hotspot - Yes, Verizon - Yes, Unlocked
9.) Theme Support - Partial, Verizon - Yes, Unlocked (need to spend more time with this, as I think only the unlocked supports icon packs)
10.) Visual Voicemail - Yes, Verizon - No, Unlocked (but there are apparently apps for this; I need to spend some time checking on this one.)