HTC seems to use mostly full on Qualcomm setups for VZW. Everything I have heard about the ReZound and network stuffs is pretty good compared to the GNex and someone on here says it seems maybe better than Moto for LTE. I don't have great issues with my GNex, but reception when not in heavily covered areas is definitely not the best and probably not something I would live with if not for the fact I am in heavily covered areas 99.9% of the time.
You have Bionic so know how it and hence Moto perfrom. I had the Bionic the first week it was out and couldn't deal with the pentile display. It didn't seem to have the most reliable 4G either, but pretty sure that has been improved with updates since I had it.
Pretty sure Samsung is probably the weakest player from a reception/coverage standpoint on VZW as it stands. I'm not so sure you can count on that remaining true going forward though?? Part of the issue also seems to be the odd branded CDMA baseband they are using with their own LTE one seems to be weak compared to the more standard Qualcomm one about everyone else uses. So reception on 3G is even kinda crappy. Basically it seems some of it is in the component selection as much as it is in the more nuance propriety aspects of the designs.
This leads me to a feeling where I am not sure you can judge upcoming devices based on current ones. LTE is a GSM derivative and Samsung seems to do great with GSM stuffs, so I expect LTE performance to mature well with them. What I am not sure of is whether they are ever going to make a device that performs well on VZW's still massive CDMA network also?? To this point I don't think they have made many such devices, if any? I am not an old VZW subscriber, but haven't heard many great thing about Samsung with them, even though I never had issues with Samsung while on ATT and TMo.