I almost always play the Bb on the E string , 6th fret. Also, I almost always play certain notes in one position only, for example Eb on the sixth fret of the A string. When you play the key of D with two sharps it's best to play in "2nd postion" . The same goes with the key of A with three sharps. Otherwise you can play most songs down near the nut. Another thing I almost never do is play the A, D or G on the open string, but instead on the fifth fret to allow faster access to the next note. It's just how I taught myself some 30 years ago but it works for me.