As of right now Angel SHOULD win but Clark WILL win rookie of the year.. At least that's how it seems.
Angel's number have shot up tremendously since Chennedy Carter has been inserted in the starting lineup. Her impact numbers are great and her worst is much better than Clark's worst. (which we saw a lot of at the beginning of the season). She even is finishing a lot better and even attacking other bigs off of the bounce with good success.
To Clark's credit, she has turned the corner after that brutal start where they were playing the Sun and Liberty everyday (It felt like), with absolutely no practice time. Their schedule was absolutely brutal at the start of the season (in terms of competition, and volume of games). Since they've had practice time, and more days off between games, her numbers have been shooting up.. She however, really dug her self a big hole numbers wise, with all of those blow out losses earlier on.
The reason I think she'll win is because the Fever's remaining schedule is clearly weaker than the Sky's (2nd weakest remaining sos in the league) and the voters are gonna be putting a lot of stock in win/loss record it seems and the Fever most likely will be multiple games better than the Sky by the end.