That's what I keep seeing here on the forum, and I am leaning towards the rollerballs. I am not too keen on adding things that could alter the scent(s). And while I would like to wear the oils myself, I don't think I want my clothes to wear them.
And thank you for the welcome! I am enjoying the madness!
I would suggest rollerbottles over sprays, because BPAL perfumes should be applied directly to the skin - they are oil-based. If you were to spray oil, it not work very well (atomizers are designed for less viscous [thick] liquids, such alcohol-based perfumes). The oil would probably squirt out in a stream and leave nice oil stains on your clothes. If you want to be able to spray BPAL, be prepared to dilute it with alcohol so that it is thin enough to spray evenly. However, changing the concentration of the perfume can sometimes slightly change how you experience the scent itself - it might smell a little different than the pure oil.
Rollerballs are much more convenient. You just swipe the applicator across your skin where you want to scent yourself (your wrists, neck, wherever), and the oil slides on in a nice, controlled layer. It's like putting on lip balm, very convenient and easy. So, rollerballs are my vote. Everyone's got an opinion, so there's mine : -) Welcome to the BPAL madness!!