Sketch user since day 1, love it. Affinity Designer is great too but feels bloated and less intuitive, esp. when you only create for the Web.
As a developer it's been a bittersweet journey to see Sketch grow to be so popular amongst designers.
In 2012 I was excited to "buy" Sketch for $50, but I am less enthused to subscribe at $100/year. At this point I'm looking for a more lightweight and longer-lived solution. Figma is a nice alternative but the price is likely only going up from here.