Follow. Lol. Im trying to see which way is best for extraction
It really depends on how much material that you want to run at once. Butane systems are easier to extract large quantities, but you probably want to winterize your BHO with ethanol for highest quality vape pens. The equipment is quite a bit more expensive and have the danger factor of using an explosive gas, likely in an enclosed space.
Doing -50C ethanol extraction is a different animal, as you have to worry about cold-filtering and bulk removal of large quantities of alcohol. It is cheap and easy to do a small amount, but the equipment starts to scale in price pretty quickly for 50+ and 100+ gram (of shatter) runs.