In my opinion, GNex is by no means a bad phone, but if you're not a ROM maniac, choosing it today is somewhat pointless, especially when compared to your Bionic (Bionic uses OMAP4430 while GNex uses OMAP4460, not much of a difference).
Why not the Verizon Moto G anyway? Also $100, not much better specs, but longer supported (support for GNex is already discontinued)
Sent from Motorola Photon Q 4G LTE @ CM11
Google Nexus 4 (CM11 Nightly)
Sony Xperia SP (CM11 Nightly)
Google Nexus 7 (2013, WiFi) (CM11 Nightly)
Samsung Galaxy Gear (Null_ Build 23)
Samsung Galaxy S WiFi 4.0 (CM10 Unofficial + GS3 Addon
HTC Incredible S (CM11 Unofficial
Nokia N97-1 (RM-505 22.0.110 Pre-Hacked)
Multi-core smartphones are like M&Ms:
They don't melt on the store shelf... Just in your hands.