A vote for Reliance
I've read plenty of baad press here on Reliance's flavor but have found an excellent use for the many gallons of peach nectar mine produces for me year after year. I mix the nectar, composed of the entire peach minus the skin, stem and pit with a good quality orange juice at a 1:1 ratio. The nectar gets canned and is quick and easy to produce.
I love the 1:1 mix and rue the day that I run out each year. Even if I had a peach that was already sweet, I'd still mix it with the orange juice because the 2 complement one another on my tongue nicely bringing out flavors in one another that aren't there individually.
So, if the point to growing is to get to where you want to go, Reliance is an excellent choice for me - extremely cold hardy and very productive with a short enough picking window to make processing not too burdensome. Just to curse myself, in 8 years the tree has never lost the blooms to frost though 2 times it seemed like it was going to be darned close. Sorry old man Winter.
One spray of Kocide in the Spring just prior to bud break each year and I've had no disease problems, lucky me, never once sprayed it for insect problems but do coat the trunk and scaffolds with a very thick coat of Surround in the Spring and keep it there all Summer for the borers.
So, for me, the tree has been an excellent choice. I have no doubt that there are sweeter peaches but mine is providing for me just fine, thank you.