Do projector screens make a big difference?

I have a full HD projector and have been using it onto an off-white wall for a few years.  The image is good but I do need to pull the curtains to get decent contrast.

My question is: Would a glass-beaded screen make an appreciable difference to the image quality - both brightness and contrast?

The convenience of just using the wall is great as the room looks 'normal' when not watching TV.  I use the projector for everything and do not own a TV but TV's of friends certainly seem more 'viewable' in daylight.

Any help and advice from people using screens would be much appreciated, thanks.