Vivaro, Trafic or Primastar ???

Actually, I’m usually in another part of the forum, but we decided to buy a bus. A minivan like Scenic, Zafira or Touran is just not my case. Anyway, my favorite was and is still the VW T5 Multivan. My wife and I visited the Nfz IAA in Hanover on the weekend and looked around us something in this vehicle class. My wife’s favorite is now Vivaro Life. The Opel is identical with the Renault Trafic and The Nissan Primastar, the Nissan, is missing in our selection because the interior is not variable. My wife prefers the Opel Vivaro Life. I couldn’t find any difference from the Trafic generation. Is there any difference between the two vehicles? Can either of them do anything better than the other? and very important how are your experiences with the 101 hp diesel engine and the large diesel with automatic transmission???