For CCO/RSO, you wash the buds with alcohol and then evaporate off the alcohol. What's left is pure cannabis oil extract. It is VERY potent! Something like the size of a grain of rice will knock most people on their butts. The CCO can be smoked/vaped like any other extract, and/or, you can dilute it with a carrier oil at different ratios to make capsules at varying levels of strength.
With an infused oil, the buds are washed with a carrier oil (such as EVOO, Coconut, Grapeseed, etc.). The carrier oil does not evaporate off, so you use the oil as-is to make capsules, topicals, cook, etc. You do NOT smoke/vape an infused oil!
There are some hazards associated with evaporating off alcohol to make RSO, but it can be done safely and this is what I do (and personally recommend!) to make capsules for my dad for Parkinson's:
I would recommend the RSO for treating just about any serious medical condition, since you start with the most potent form and can dilute down from there, including infusing the RSO into a carrier oil of your choice at the ratio of your choice which, IMHO, makes dosing much easier.
If you wanted to make budder, or an infused oil to cook with, the MB2E can't be beat! You can also make caps from the infused oil out of the MB2E, but again, you won't be able to smoke it or get it to the same level of potency as RSO.
I hope that helps!