To say that Nocioni is a spotty defender at best, and that Jeffries is both a great defender, and has some offensive skill...well, let's just say I am not on the same page with you.
Jeffries is a pretty terrible basketball player. He is a horrendous perimeter player on offense, and has no low post game either. Basically, his only offensive skill is being really long, so he can finish wide-open layups. And defensively, while he does some things well, he is by no means a great defender. He has made a lot of money off of one playoff series where he played pretty good defense. Now, he is someone I wouldn't touch with a ten foot pole, unless we were getting a major asset in return.