From experience, things like the SLX brakes and XT drive train components will sell very easily.
Stuff like the Whyte branded controls won’t sell as easily or for a great price.
Your forks will probably sell well, and the frame will largely depend on whether or not someone is looking for a Whyte. Not as large a group of 2nd hand buyers compared to other brands, but the frames don’t come up as often either, so if someone is looking then you may well get what you want for it.
If you can sell as a whole bike for a price you’re happy with then it’s generally far more preferable. Taking pictures, sorting out ads, replying to queries, multiple payments, packaging individually, trips to the post office etc for a whole bike split is a pain!