Unfortunately, while I grow quite a lot of apple trees considering the size of our yard, I haven’t yet had the opportunity to taste a lot of homegrown apples, partly because our trees are still pretty young, and partly because squirrels.
@Marco Take this with a giant grain of salt, because these reviews are based on a literal handful of fruit, but my favorites from our trees so far, in rough order.
Adams Pearmain: Rich, well-balanced flavor. Midseason for us, but triploid. Less vigorous, more precocious tree with pretty blossoms.
Hunt Russet: I really like this one. Sweet and tart with a bit of orange to the taste. (The citrus, not the color.) A bit later than AP as I recall. Stronger growing tree with pretty blossoms.
Kidd’s Orange Red: Milder than the two above but very pleasant, with more crunch and juice. (Calling AP and HR dry and hard would give the wrong impression, but they’re definitely not Honeycrisp.) About the same time as HR. Moderately vigorous, pretty blossoms.
Black Oxford: Similar to HR but a bit sharper, like tangerine as opposed to orange. (To be fair, this is really a storage apple and I ate mine straight off the tree because I only had the one. $#**$^%$# squirrels…) Slightly later. One of my most vigorous trees, pretty blossoms.
Mother: Has a reputation for being very variable and that’s been my (limited) experience. One very nice apple with a touch of vanilla and a curiously cooling effect in the mouth, and one that was pleasant enough but not a lot going on. Second to ripen after AP if I recall correctly. Moderately vigorous, pretty blossoms.
Hubbardston Nonesuch (I think - bit of a mixup with tags): Pleasant apple-that-tasted-like-an-apple. Midseason, moderate vigor.
I’ve had a couple others that were disappointing but I’m not going to name names because (a) some of them were picked way too early because the squirrels and/or birds were getting after them, (b) at least one may not be what it was supposed to be, and (c) it’s way to early to form a negative judgment.
Korean Giant has been very easy to grow so far. Precocious, prolific, and pleasant eating, though the fruit was very-not-giant (probably due to the drought last year), and not as crisp as Asian pears that I’ve bought in the past.
I haven’t sprayed yet. Issues so far have been aphids (mostly just an annoyance, controlled by squishing), pear blister mites (big problem on European pears but they seem to be growing out of them, KG seems less affected), Cedar Apple Rust (annoying but mostly cosmetic on the varieties I grow), and Marsonnina leaf blotch (this one has been my main problem so far - will cause early defoliation and may be the thing that prompts me to actually start spraying).
I haven’t seen much if any evidence of scab as yet (I did try to pick out less susceptible varieties).
Hope this is helpful (but again, do take it with a grain of salt - I’m just starting to learn myself).