I have not paid attention in the past 5-10 years, so the breeding has likely advanced, but here is my opinion from many I have grown and seen in person.
The first generation vini had smaller flowers that would always reflex. However the color could be extremely striking, with a fully saturated lip. I had a few, one with amazing flowers but the plants did not live long.
The first generation of crosses between vini and regular delenatii were really underwhelming, larger flowers but kind of a washed out pink color and poor form. This seems to be the majority of plants on the market today. I have one of them, but really miss having a true delenatii in my collection.