I never trust color representation on a computer monitor, as the result can vary greatly depending on the monitor. Luckily, I live in an area with lots of Model 3s, so I used that as a guide. I ended up with white - in person, the pearl white just gleams and is gorgeous! I never thought I'd ever buy a white car.
BTW, I've seen owner pictures of the white Model Y. Similar to the Model 3, that color really shows off the lines. It makes the Model Y look like a futuristic tear drop, very cool. I would have ordered white (went for blue), but having two white Teslas was a bit much. Plus, if one of us says "I'm taking the white car" it would be confusing.