PS It is easier to learn scales on guitar than piano. The finger patterns don't change as they are transposed up or down the fretboard, wheras on piano there are only a few scales that use the same fingering.

On piano it's easier to "see" the key signatures though (the sharps and flats). They're all laid out in black in white, right before your eyes!

But I disagree with GUEST about the B scale on the piano. It's one of the simplest for students to manage on the piano, because all 5 black keys are used. First, this leaves only two possible choices for placing the thumb comfortably. Happily, those are the 'correct' ones - on the two remaining white keys. (The thumb is used on the white keys wherever possible on the piano. It's so short the black keys are an awkward reach). And second, when you try the B scale hands together you find the thumbs play at the same time - much easier than the alternating required with the white-key scales.

Sorry if that makes sense only to piano players - on a guitar thread no less! - but hey, just had to say it!