As an advanced amateur pianist, F major and C major are my least favorite scales. F major has the awkward B flat and C major has no good reference by feel for where you are on the keyboard.
Personally, 3 sharps/flats are the easiest scales for me. A lot of people like B and C# because you have 5 and 7 sharps that make it really easy to find the notes (F# is marginally harder...).
Personally, 3 sharps/flats are the easiest scales for me. A lot of people like B and C# because you have 5 and 7 sharps that make it really easy to find the notes (F# is marginally harder...).