I have been shopping for a replacement toilet when I came across a plumbing sales guy who told me that 2 piece toilets flush better than 1 piece toilets. I have no reason to not believe him but I searched the internet for an opinion, one way or the other, and found nothing. So, I'll throw it to you guys: Does a 2 piece toilet flush better than a 1 piece toilet? I am speaking about 1.2 gallon models. Thanks