Each to their own, but I find it’s best to learn the semitone intervals that make up the standard Ionian major scale, and then how those intervals vary slightly in each mode.
On a fretted instrument the Standard major ascends any open string by 2 frets, then another 2, then 1, then 2, then 2, then 2, then 1. Whereas the Mixolydian ascends by 2, 1, 2, 2, 2, 1, 2.