New ones for sure. Those stab-ins come loose much easier and are harder to get right. There are some stab-ins that are transparent, those at least allow you to inspect that the wire is seated properly. But be careful when you manipulate them to close a junction box because any twisting of the wire can cause them to slip loose.
Oh, I meant the gray 222s vs the clear 221s. The whole "I can see it right" thing is nice with the 221s, but I've had people tell me that the 221s don't hold as well as the 222s.
