I have a 1.25" main line that comes into the house. It currently is soft(not so much) but not straight copper after the main shutoff. I want to replace this wavy 28' of piping from the main valve up.

Main valve is a new ball valve so I'm not worried bout that, my concern more about is there a big difference between 1" and 1.25". I want to keep it at 1.25" but that size tubing is not as common and readily available and there is premium on it b.c of that. What am I losing if anything going down to 1"?