Each type of extraction yields a different odor profile from the same plant material - you can't really say one type is always going to be better or more beautiful than another. For example, a rose otto vs rose absolute vs rose concrete vs hydrosol all retain different proportions of the molecules comprising the rose scent, and none of them completely match the headspace of the living flowers. As your obsession grows you may find you need to experience all of them
Re: Champaca, I don't have it in EO ... I have some concrete and attar from White Lotus Aromatics and some CO2 from Eden; they're very different and I prefer working with the CO2 but that's just a single case.
Do you belong to any of the natural / botanical perfumery groups? You can elicit much more varied and detailed feedback from multiple perfumers on questions like this; very helpful when you're starting out.
In general, it's good to try to obtain the best quality materials you can ... their beauty will inspire and gratify you, while the deficits in poor quality materials will only frustrate your desire to create something beautiful out of them. A 1-ml sample of something gorgeous will be worth more to you than 30 ml of something mediocre that you never end up using.