I love candles but can't justify spending tens of pounds on one candle.
The Aldi Jo Malone copy candles are good and you can actually smell them, unlike some of the other cheap copies. I like the lime, basil and mandarin one - £3.99
I really dislike vanilla scented candles or anything sickly smelling. Apart from l/b/m ones I quite like the cotton fresh or spa type ones.
Next candles are lovely and keep their smell. Likewise their diffusers.
A cautionary tale, about ten years a friend of mind became a fan of Yankee candles and used to burn them every night in the living room. Strange black patches started appearing on her wall at the join between the ceiling and the wall. She couldn't get it off as it was greasy. I turned out it was caused by the Yankee candles. I don't know what kind of wax they are made from, and this was ten years ago so it may be different now.
When you think about it, where does all the wax go when you burn a candle. Obviously, it goes into the atmosphere in the room. If this is the case, I don't suppose it is healthy to have candles burning all the time, especially perfumed ones. It is kind of on a par with vaping - IYSWIM
Not the actual friend but found this online about the soot damage
andyyankeecandles.blogspot.com/2013/11/yankee-candles-and-soot-damage.html
I bought an old fashioned oil lamp a while ago, as an alternative, but I have yet to use it.