I am inclined to solder, but in a house I had for 35 years, I was
reluctant to solder some pipes near the water meter. I was putting in a
"wet" darkroom for photographic work. I made it a point to CLEAN the
tubing well, and to lubricate it well (threads, pipe) before using the
compression fittings. For the 4 additional years I owned the house, I
had no problems at all with the compression fittings. Clean was the
trick, I believe.