Gardenia is my favorite for white candles. I use this for meditation.
I like frankincense for prayers to Ares. They have this manly fatherly smell in my opinion.
For oils I get fruity stuff to anoint candles. Candles that already smell like fruit are way too strong. It's better if I can apply it subitly myself as to not over do it.
Vanilla is an absolute no, I hate the scent. That and birthday cake, it smells so bad.
Other scents I like are rose, white sage, lilac, lavander, rain/ocean, and so forth.