Vaporizers work best when the weed is completely dry, not moist. I know that this may be counterintuitive to most of us, but trust me on this one.
When using completely dry weed- you can grind it better which will improve your session, the air will be able to travel through your herb properly and extract the THC/ CBD, you will get more vapor. And if all this wasn’t enough, it’ll be easier to clean your vape after a session (less sticky stuff). So yes definitely dry weed is better.
Most medical marijuana sold in dispensaries around the US is already completely cured and dry, and ready to use with a vape.
If your weed is moist, there are various ways you can dry it. Some involve putting it a paper overnight to suck up the moister; some will leave it in a glass jar and open daily- eventually, the moister evaporates, and you’re left with dry herb, perfect for vaping.