Wiparat, its hard to say which one is my favorite. So far I think it is my seedling fruit tree "KT11-Lisa" which is not large enough to share cuttings, flesh is white. I have 15 seedling trees I grew and KT1,2,3,4 & 11 fruits are as good as any top 3 so far. The other seedling trees have fruits that are average, not as good as Big Jim(orange flesh) or Vista White(white flesh). But you never know, the flavor of the seedling trees may improve in a few more years. The three varieties I have for sale now have proven flavor, the trees are over 15 yrs old and have been fruiting with same very good taste.
I also have maybe 10 more named varieties that I grafted which has been said to be rated top 3 so when I taste those (hopefully fruits this summer), I can compare them all together and update my number one favorite.