User blog comment:Firemaker2468/Gameplay/@comment-30865154-20170106092034

To really answer your question:

1. Stable: The stable Version is like it says as stable as possible (for a Alpha) and gets updated from time to time! (every week once, don't know it anymore)

2. Experimental: This Version can be full of bugs and is updated 2-3 times a DAY!!! It's nearly possible to "see" what they are doing (design, landscape, modules, items etc) InGame (Not while playing (is it possible to update in Background with Steam while playing???), but after restart).

I am playing experimental only and never had a Problem (only if I Close to Desktop after saving my game it crashes). Also with experimental you can help the developers alot more, but that is maybe just my opinion!