Well, subjective assessments can differ, but it was Anigwe, not Turner, who
won Naismith National Defensive Player of the Year. And that's especially impressive considering that Anigwe was not on a team getting lots of national press attention, unlike Turner. (Incidentally, Turner had 109 blocks to Anigwe's 57, and Anigwe had 353 defensive rebounds to Turner's 201. And of course, Turner played in three more games than Anigwe.)
I think they're similar players but hard to compare because Turner had so much more help than Anigwe did. Turner attempted 353 shots this year; Anigwe attempted
547. Of course Anigwe's shooting percentage will be lower. That's simply a much heavier load to carry throughout a season. And Anigwe ended up in the top 10 in scoring and #1 in rebounds despite being basically double and sometimes even triple-teamed all season. Turner having another big like Shepard meant that she had so many more open looks to the basket than Anigwe ever got - many, many more clean shots.
(And BTW: the only player in the country who was among the top 25 in total FG attempts and also top 25 in FG shooting % was Megan Gustafson, a big who was taken 17th overall/5th in the second round. So apparently neither of those statistics is, on its own, overly important to sizing up WNBA potential.)
I do think Turner is a bit more agile and versatile as a scorer than Anigwe, but I definitely don't think it's right to say that she's a better defender than Anigwe, and I think it's a reasonable toss-up as to who I'd take if I were a WNBA coach.