I recommend you try out the mineos-node (new) in a virtual machine or a separate box. You can then test it out before you take down your normal, production server. LOTS has improved, but the two projects have different goals. The Python-based webui (hexparrot/mineos) was very memory-conscious and less-responsive (as far as the UI was concerned).
The Node-based webui (hexparrot/mineos) is not very memory-conscious, and will, in almost all circumstances take up more memory, sometimes in the range of 70MB+. Of course, 70MB isn't really a lot, but that's my viewpoint and many server admins see every MB as being vital. This memory, however, is the tradeoff for a number of various improvements that are only experienced in terms of convenience, such as the elimination of the confusing profile system (one click downloads for all server types), webui pages auto-refreshing, built in cron-jobs, and the fact that I only maintain this repo (because it's much too much work to maintain both).