I really like the olive oil for versatility. Even recipes that call for butter, evoo is an acceptable substitute.
I can use oil to make gummies & cookies, but can only use the butter for cookies. That's why I generally make olive oil.
Tincture is a new method that I plan on trying very soon. I can't really give advice on the topic at all, but if you go this route, please shoot some pics and share with us in the cooking thread! I know a few of us have been thinking about a tincture run.
If you're looking for crazy strong oil, and have enough bud to do it, you can double infuse a batch.
Basically, run a batch of 28g to 1cup oil. Decarb, then infuse for 6 hours on low heat. Strain and reuse the oil with another 28g of fresh buds. Decarb and run another 6 hours infusing with the oil from the first run.
You may need to top off a bit of oil for the second run, but generally only 1-2 Tbsp.
Tons of ways to skin that cat, all of them will result in you getting faded!
Just gotta find which one you like best!