Q: What is the difference between VeraEdge, VeraPlus, and VeraSecure?

VeraEdge has the smallest form factor between all Vera units. It includes 128MB of RAM memory, WiFi, one USB port, and the latest generation of Z-Wave Plus chip built in. All of this allows it to control up to 220 devices.
VeraPlus has even more protocols built in. it has Zwave, ZigBee, and Bluetooth, one ethernet port (WAN), the latest generation of Z-Wave Plus chip built, twice the RAM memory, a dual-core processor
VeraSecure is our flagship controller. It has all the capabilities of VeraPlus and more. VeraSecure is the modern day replacement for a security panel. It has more memory, controlling up to around 200 devices!

Additionally, here are some of the cool features of the VeraSecure:

In case your power goes out, a built-in backup battery will keep your VeraSecure controller up and running for up to 4 hours
In case your internet service goes out, the cellular backup, which works with the optional VeraProtect service, can continue to send alerts or summon help from the VeraProtect call center
There is also a call button on the top, so in the event of an emergency, you can talk to the call center right through the VeraSecure's built-in microphone and speaker
A loud siren alarm is built-in, to scare off intruders.
VeraSecure has a longer range and better battery life

A hardware comparison chart and more details about each unit can be found here:

What is the difference between VeraSecure, VeraPlus, and VeraEdge?