You might wanna try UI design in Illustrator. You get all the vector benefits of Sketch, and artboards, and much more powerful drawing tools. The only downside is worse snapping to points and poor bitmap rendering/anti-aliasing, but those aren't as important for prototyping.
Honestly after switching to Illustrator I can't stand using Photoshop for UI design or prototyping.
You might wanna try UI design in Illustrator. You get all the vector benefits of Sketch, and artboards, and much more powerful drawing tools. The only downside is worse snapping to points and poor bitmap rendering/anti-aliasing, but those aren't as important for prototyping.
Honestly after switching to Illustrator I can't stand using Photoshop for UI design or prototyping.