Look at sneaky @mamuang drawing me into a discussion (again!) during my late spring/summer/early fall forum hibernation. We will have words about this!
My climate may be even more different from Lodidian’s than Scott’s is. I’m cooler at night than he, but have almost no humidity, the summer sun is intense, and I have to irrigate because we get almost no precipitation between mid-May and mid-October. Be that as it may, with respect to the apples in the OP that I grow, my words of “wisdom” follow a similar path as Scott’s.
I’ve grown Karmijn for 15 years. The very first apple it delivered was incredible. Every single apple since that managed to not prematurely fall from the tree (90%) either corked, cracked and rotted, or just rotted. But the potential from that first apple…! I top worked it two years ago to a bunch of other Cox offspring, many of which will probably follow a similarly unproductive arc here, if my Cox apple experience holds true, but I did leave one small branch of Karmijn, because hope springs eternal.
KOR has not been very productive here, but it is as Scott describes, very sweet with some acid and overall a fine tasting apple. Rubinette is far and away the best of the three in productivity and taste. I’m a sucker for “smack me in the face” flavor, and Rubinette delivers. Flavorwise, it has some relationship to KOR, but is so much more. It might be a closer thing with Karmijn, given that apple’s reputation as a high acid, high sugar, high complexity fruit, but it’s a lot easier to grow. Plant it.
I have a third leaf Adam’s Pearmain that hasn’t fruited yet, but have had several crops from my fully biennial Orlean’s Reinette. I can’t imagine they are that similar that you wouldn’t want both in your orchard. OR is a bit of a PITA to grow here, but when it sets a heavy crop, as it has this year, it reminds me just how great it can be. I have only eaten one other apple that resembles it in flavor (it’s unique, even among russets), a misidentified mystery russet that delivered a few excellent apples last year from a small branch. It probably isn’t OR. Anyway, both OR and Rubinette are in my top five apples for eating. If Adam’s comes close to that, I’ll be a happy home orchardist.
I haven’t grown any of the other apples listed in the OP, so I can’t weigh in.