Yes, there are a lot of options. An extensive thread about it is
here.
I've chosen to use a Staedler Norris digital for my Onyx Boox Note Pro, but there's a lot out there. Just make sure that they have the correct technology inside. I basically couldn't work with the supplied stylus and am quite happy with the Staedler.
However, it is all down to personal preference. My wife thinks that the original stylus is better than the Staedler.
It's a pen. People will b*tch and moan about it if it doesn't work the way they want it to. I personally always prefer thick fountain pens over thin ones. My father and my wife prefer thin ones. There you have it: New age, new technology, same people!