Is there any functional difference between the two- and the three-band Simpson Super brushes? I see the cosmetic difference (not important to me), but is there a difference in brush feel, lathering qualities, etc.? I ask because I can get a Simpson Polo 8 in (regular 3-band) Super for about $20 less than a 2-band one, but I'd be willing to spend the extra $ if I'm getting a functionally superior brush. Thanks.