We've put together this matrix with a few examples of where we think Traditional Ubuntu (apt-get) and Transactional Ubuntu (snappy) might make sense in your environment. Note that this is, of course, not a comprehensive list.
|Minimal Docker and LXC images||Desktop, Laptop, Personal Workstations||Baremetal, MAAS, OpenStack, General Purpose Cloud Images|
|Minimal IoT Devices and Micro-Services Architecture Cloud Images||Touch, Phones, Tablets||Comfy, Human Developer Interaction (over SSH) in an atomically updated environment|
I've presupposed a few of the questions you might ask, while you're digesting this new landscape...
Q: I'm looking for the smallest possible Ubuntu image that still supports apt-get...
A: You want our Traditional Ubuntu Core. This is often useful in building Docker and LXC containers.
Q: I'm building the next wearable IoT device/drone/robot, and perhaps deploying a fleet of atomically updated micro-services to the cloud...
A: You want Snappy Ubuntu Core.
Q: I want to install the best damn Linux on my laptop, desktop, or personal workstation, with industry best security practices, 30K+ freely available open source packages, freely available, with extensive support for hardware devices and proprietary add-ons...
A: You want the same Ubuntu Desktop that we've been shipping for 10+ years, on time, every time ;-)
Q: I want that same converged, tasteful Ubuntu experience on your personal, smart devices like my Phones and Tablets...
A: You want Ubuntu Touch, which is a very graphical human interface focused expression of Snappy Ubuntu.
Q: I'm deploying Linux onto bare metal servers at scale in the data center, perhaps building IaaS clouds using OpenStack or PaaS cloud using CloudFoundry? And I'm launching general purpose Linux server instances in public clouds (like AWS, Azure, or GCE) and private clouds...
A: You want the traditional apt-get Ubuntu Server.
Q: I'm developing and debugging applications, services, or frameworks for Snappy Ubuntu devices or cloud instances?
A: You want Comfy Ubuntu Server, which is a command line human interface extension of Snappy Ubuntu, with a number of conveniences and amenities (ssh, byobu, manpages, editors, etc.) that won't be typically included in the minimal Snappy Ubuntu Core build. [*Note that the Comfy images will be available very soon]