Yeah, it is asked a lot, but... It's a good thing it's being asked again, 'cause things have kinda changed.
The standard answer used to be that a DA type machine was recommended to new guys, as they are much safer to use than a rotary. The caveat being that you really were limited in how much correction you could accomplish with a DA (that being not very much).
As mentioned... things have changed. You'll see/hear a lot more about pros using DA's instead of rotaries. The reason being is
Meg's new polishes (in particular
M105 and M205) have re-written the book (with help from Kevin Brown) on how much you can accomplish with a DA.
A DA type polisher,
M105, M205, and the appropriate pads will serve a new guy very well.