Hi,
I know it sounds like a troll, but I am serious.
I do know armory is full node (via Bitcoin Core), whilst copay is SPV — and I know the
limitations of SPV.
I do know also that Armory has GPU-resistant algorithms.
Beside this, though, I fail to see noticeable differences.
copay can do multisig and emulate offline transactions and watching-only with privkey-less wallet and payment proposals (
here). It can do multi-wallet too and it has mnemonic seed (which Armory doesn't have, although root key is an OK replacement, albeit cumbersome). Plus, copay is open-source.
Armory has fragmented backup, which appears to me as stripped-down version of multisig (multisig only at restoration time), so it doesn't really count.
So, barring operating full node and being GPU-resistant (which is very important), what else is left for Armory? I bet the enterprise support is top-notch and Armory (the company) follows the same path as the Red Hat company does for Linux.
Thanks and again, please don't see it as trolling, I'm honestly wondering since I plan to offer consulting services.