I don't think I've actually used the Parker inks, but I find that the Noodler's inks have good flow, aren't too wet, and have good color, in the Lamy I've tried them in. But, I've heard that the Parker inks are good for that, too. Also, Noodler's has some inks that bind to the paper, and the only way to get rid of them is to destroy the paper, meant to be fraudproof inks (to avoid check washing) - their black is the strongest of those.
The Diamine ink that I've got in my Lamy now... doesn't flow all too well, runs out quickly, and is wet. Very weird combination, usually when it's wet like that, it flows TOO quickly.