If you plan to customize the 10/22 with a new barrel and stock like many do, then it is a waste of $30.
If you plan to keep it stock, then you get an extra 4" of sight radius, which helps with accuracy. If your going to mount a scope it probably does not matter, except that the stock is a little better than the standard model for a large adult. If you are small statured or plan for a child to shoot it the smaller standard model and stock is better.
I would not worry about the extra barrel length slowing the bullet down, I would like to see some chrono results to back that urban myth up.
Finally if you like to hunt pesky tree rats in an urban /suburban setting, the 22 inch barrel will be very quiet with CB caps, and subsonic ammo, much quieter than the standard barrel.
JMHO YMMV