I enjoyed watching the documentary, Zara and Anne: Like Mother Like Daughter not just because Victoria Arbiter, Hugo Vickers and Katie Nicholl are contributing. I'm quite happy that the program tried to stay focus on Anne and Zara rather than constant comparison to other members of the Royal Family. Yes, there may be some occasion of comparing Zara to William, Harry, Beatrice and Eugenie, but they also mentioned about how close they are as cousins. The documentary does provide a great source for the similarity and closed relationship between Princess Anne and Zara Tindall.
It's also interesting how Nick Skelton (British Olympic Gold Medallist for Individual jumping at Rio) was mentioned as an indication that Equestrian career can last up to when the horse rider is in his/her 50s, unlike other sports. Some commentators suggest that Zara could be riding and competing in the future and have a long career in it. Nick Skelton retired at aged 59 on 5 April 2017, after riding since he was 18 months old and competing since the 1970s.
I would recommend this documentary if you are like me have no comprehensive/extensive (i.e. sound/basic) knowledge on Princess Anne and Zara Tindall. For those who are expert or with comprehensive understanding, the documentary could be a bit underwhelming.