Yeah, it's important to remember that we're talking about a possible third-stringer, and Childress seems reasonable for that role—although he's a mediocre (at best) 3pt shooter, for his career he does average about 10 points and 5-6 rebounds per 30 minutes, which is decent.
Then again, Pietrus has good-to-great defense, a killer personality, and he should be healthier now (and thus, hopefully, more potent offensively). Plus, he already knows the team and system.