u/Chromstrike

I've been thinking of getting some better makeup brushes for a while. Bought the fenty foundation and concealer one not too long ago. I was watching videos on YouTube and saw a few recommendations - most notably I've seen Hourglass and BK beauty brushes mentioned often.

I saw that there is a sale for both of these. I was wondering if anyone has any insight into if these are a good choice or if one is better over the other?

Would you also say buying sets is worthwhile or is it better to buy individually?