As most posters have said already, it does not matter
whether you use a two-handed or one-handed backhand.
I started with two-handed backhand, but later switched
to one-handed because I wanted more versatility,
maneuverability and quickness at the net. This does not
imply, of course, that I could not get the same when using
two-handed backhand. It's just that I am more comfortable
and at ease with the one-hander.
If your mechanics are correct, and the timing's near
perfect, then either method will bring you good results.