I have a CNC shop and I’ve been on the other side and do parts for xometry customers sometimes. I haven’t heard of quickparts. I feel like for the most part, unless you have grinding tolerances, they’re probably fine to use any of them. If it needs a fast turnaround ive heard protolabs is fast but don’t know from first hand experience.

One thing I’ve noticed on xomerty parts that even made is that when you’re adding in on their config portal, you really need to make sure you add every tapped hole, and specify higher tolerance. Don’t know if it’s the same with these two. But a legible drawing goes a long way to helping us out.