Apologize in advance if this already exists. I tried searching and came up with nothing.
I had an idea to make a stickied topic or google doc with a list of machine blocks categorized by their function, but sortable by their efficiency. For example I can name 3 electric furnaces off the top of my head. Mekanism is probably the most user friendly, especially early on, it uses a small amount of energy to run and goes about the same rate as a vanilla furnace. The Galacticraft Core's takes more energy but cycles almost twice as fast. Physica's takes so much energy it seems broken and doesn't