Slim or wide bowl, and which size
The slim bowl is the standard for young, fresh wine. It keeps the surface of the wine small, so the wine stays cool and the acidity crisp, and it funnels the aroma towards your nose. That is exactly what sauvignon blanc, riesling and pinot grigio need, and for that you count on 20 to 30 cl.
Fuller white wine asks for the opposite. A mature chardonnay has oak notes and creaminess that only open up with more air, and for that a wider bowl of 35 to 45 cl works better. That model looks like a small red wine glass and is used that way in hospitality too, with one series for both colours.
If you are tasting rather than drinking, there are small tasting glasses of 13 to 22 cl, often with a fill line so every pour is equal. Red wine calls for roomier sizes, which you will find with the red wine glasses. At home, count on two glasses per guest; in hospitality, on two to three times your number of covers.