I have both. I'd say the workmanship is similar, but I'm not a gunsmith. With the Colt you get the 80 series firing pin lock. It's a complication that I believe is unnecessary, and I'd rather not have it. The sights and sight cuts are actual Novak's, so upgrading the sights is easy. Colt uses a small diameter barrel for 9mm. If you decide to install a bushing with tighter tolerances, you'll have need a company such as EGW to make a custom bushing. Colt uses an un-ramped barrel. Many folks say these will experience feeding problems with 9mm ammunition. I have never had any problems with mine. The Colt thumb safety has a bit of spongy over travel in the off position. The grip safeties on my examples fit loosely and rattle. My big problem with the Colt is the undercut where the trigger guard meets the front of the frame. It allows the gun to sit a bit lower in the hand, but the grip safety Colt uses doesn't allow that. At least in my hands. So, I install an Ed Brown model which requires filing on the frame and re-finishing. But when I'm done it fits like nothing else.
The Springfield has Novak styled sights and it's a bit more involved to find replacements. Some fit and some don't. The Springfield 9mm uses a ramped barrel, it works fine for me. The internal parts on the Springfield are MIM, If I encounter problems I'll change them with high grade parts. For me, the Springfield has the most comfortable and useable thumb safety pad of any I've found. I have a big problem with the Springfield also, it's the cast slide stop they use. Some have casting marks on the pin. These are sharp enough to put grooves in the lower barrel lugs that rest on the pin. I plan on replacing the slide stop on any Springfield I buy. My 9mm is a Springfield Ronin 4.25, the .45 is a Colt Lightweight Commander. I believe each has its quirks, but they are easily fixed. Good luck, I hope this helps.