DisplayMate rates smartphone displays of all kinds, mobile ones included.  For the last few years, Samsung has held the crown of best mobile phone display with their Galaxy and Note lines, but their run of supremacy has been ended by the iPhone X.  DisplayMate has quite a bit of technical information on their site but its worth a read if you want to know how it was that Apple has knocked off the champs at Samsung.

See the source link here and check it out.  The king is dead; long live the king!