Well
@reids I can't say I'm nearly as scientific as some are here. I didn't sift through all the options and just liked the Spitfire harp so I finally bought it.
I used the EWQLSO harp for ages (it still works quite well in a mix) and only fairly recently jumped to Spitfire. I keep hearing about chocolate audio and others...
...but here's the thing -- if you have good speakers / headphones, listen for
yourself and trust your own taste. In the end, our
musical taste, by which I mean our choices of the samples we select, the way we play staccato, the way we use drums, whether or not we use functional (i.e. V-I type) harmony or guitar band chord progressions -- all our choices create an aggregate impression on the listener.
If you're fortunate, what
you like will line up with what an audience / director likes, and then you're going to be popular and make some money. But I do think you / we all should honour our own predilections and at least we'll have a shot at making something of which we can be proud.
The worst? -- A pale imitation of someone else's ideas.
Don't ever take my or anyone else's word for what's "good." That's what you decide for yourself. When we are learning we all imitate things, but hopefully over time you'll end up writing something more and more personal.