it shouldnt but essentially the larger capacity motor will give it higher RPM's... to be honest, if its a DA and your are not going to be using it as a pro i.e. every day of the week potentially then the standard model will be more than enough... My Megs G220 has 6 speeds, i have never needed to use more than speed 5 on it so its never ran at full chat, ever !
the only thing i dont like about the G220 is that the dial to adjust the speed in on the back of the machine by the mains cable and when in use it takes a bit of practice to be able to speed it up or down on the go.
I think the Megs, Kestrel and DoDo Juice Buff Daddy are all basically the same machine, the Kestrel and Buff Daddy look identical though.