You can sight in very well with either one, providing you are using a GOOD bipod, such as a Harris or a Caldwell and not one of the $30 plastic cheapies folks like to put on their 15-22. You can also use sandbag rests - anything as long as it's a SOLID support.
Zeroing is neither difficult nor time consuming. With the rifle in a solid support, center the crosshairs on the bullseye and fire one round. Without moving the rifle, adjust the scope to center the crosshairs on the bullet hole. Put the crosshairs (without adjusting the scope again) on the bullseye again and fire a couple of shots to confirm the zero.
Shouldn't take more than two or three minutes.