New LF3 v. LZ8 and phone app?

[scottmc]

Looking at purchasing some cameras and I'm interested in Linked cameras.  Is there a major difference between the LF3 and the LZ8, other than resolution (2 v. 1 megapixels)?  How about size - the manuals say 4" x 2.5" x 2.8", but more for mounting.  Also, can they be connected by Ethernet at a later date, or is that only the older, lower resolution Airsight cameras? One more - Am I reading the user manual correctly that both of these will also connect to the WWAN (Verizon, ATT, etc.)?  Last, if you have either of these, would you buy more/again?  Thanks.