We get ours from Puritan’s Pride simply because it is cheaper, and they now offer free shipping on all purchases. Their essential oils are extracted by steam distillation (which is what you want to look for in an essential oil, so it has been said), and they also have organic essential oils available. There is no regulation as to the manufacture of essential oils, so there is really no reason to assume that those claiming to be of a certain grade are any better. I believe MissusLeata (I could be wrong, but don’t have time to search her posts) has mentioned a company called BeeYoutiful (again, I’m not sure) had an article on their site that addresses this.
Okay, I did find a link to her post after all….here it is. https://simplycharlottemason.com/scmforum/topic/essential-oils-question
As far as which to buy, you can search essential oils on this forum and find some good threads. My two must-haves are tea tree and lavender because I use them for cleaning and for calming/assisting sleep (the lavender), but I also like peppermint, orange, and eucalyptus. My daughter wants me to get some lemon oil so she can use it in her homemade hand lotions and sugar scrubs for Christmas gifts.