air compressor plumbing

I'm getting ready to redo the air compressor plumbing in my shop with RapidAir Maxline 1/2" kit. I have a Dewalt 30 gallon compressor and am currently using a harbor freight filter/regulator that has the 1/4" outlet. RapidAir recommends their 1/2" regulator for their 1/2" line. I connect from the air compressor to the regulator via the quick connect coupler on the compressor since my air compressor is on wheels I do occasionally move it for outside/house projects. I was thinking about upgrading from my current regulator to the 1/2" regulator but since the connection to the air compressor is via the quick connect coupler would it really make any difference?