To put it bluntly, Delores is subpar at best.
Out of all that have been or will be released, Cotton Candy and Phoenix are by far head and shoulders above the rest.
Next would be Kathy which for those who have not had it and as described above, is from the ZINC just as Sweet Tart is. Fruit size is larger than ST. Taste is different and very good but those with a keen set of taste buds will detect the relationship between the three.
Seacrest comes from an Edward which I believe may have been crossed with Gary. It can be good but would not put it in that top class as LZ, ST. OS, CC, Phoenix, Peach Cobbler. Juicy Peach, etc. It falls more under the category of a clean, sweet and juicy mango such as Harvest Moon but lacks that "wow factor" like those in what I and others would call top tier.