It depends on what context we are speaking of when you refer to "the top diva". There are four different ways to look at this. The best in kayfabe, the most accomplished, the best wrestler, and the best overall. If you mean the girl who, within kayfabe, is the best in the division then that is whoever holds the Divas Championship. It is with much sadness that I must state it is Nikki Bella, in that case. However, if we are referring to who is the best when it comes to accomplishments, that goes to Paige. Longest reigning NXT Women's Champion and 2 time Divas Champion with the first time being her debut on Raw. The next possibility is if we are discussing who the top diva is in terms of legitimate in-ring skills. That goes to Becky Lynch with Paige, Charlotte, and Sasha not far behind her. A similar list is the answer when you take an overall look between in-ring and mic skills without getting into title win stats.