I'm pretty sure you're hands will move faster because of muscle memory, your body remembers how hard it was pushing to move the big glove, and you'll unconsciously put the same force into punches with the lighter ones, causing a faster fist. it's the same for punching with weights or running with ankle weights. you will move faster, but not forever, because your muscles will realize they don't need to put as much force in to get the same speed as before, and you'll slow down. i recommend gradually increasing glove size during training then use smaller gloves during the fight and you'll be trained to swing faster.
Both are great, both beat Tyson, fair and square. As far as I'm concerned, Tyson revived Heavyweight boxing with his career and is the best of his time. But between Holyfield and Lewis, I'd have to say Holyfield, because he fought Tyson when he was more lethal, and wasn't overly upset about the ear thing, but then again, he had no right to be, he brought it onto himself with those butts...
I think if the two were put up to fight each other Lennox would win pretty easily (if they were both in prime) but I just think Evander has accomplished more and is more famous, especially because he's the guy that got Tyson THAT angry.