I agree that most who have been on this forum for several years have seen a large number of issues reported with Samsung. Yes, as you've said there have been more than with other manufacturers.
One thing to remember however is that Samsung sells more smartphones than any other manufacturer. Also, though tablet sales are in serious decline Samsung is still second to only Apple. Given the large number of Samsung devices out there in the world combined with the way the Android OS is significantly splintered, it makes sense to me that we'd see more reported issues with Samsung devices. I'd also expect that there are more unreported "non issues" with Samsung devices.
To your point that "even the same tablet or phone" works sometimes and not others. I do always find it interesting when this is reported. Exactly the same models with exactly the same software with exactly the same AC/RC will work brilliantly for some and is a nightmare for others. I always just assume that either in reality something is not exactly the same, or I assume that the technical level of the users are different and they are missing something. Yes, in a perfect world having success connecting to your drone should not be reliant on a person's level of technical expertise. Don't forget however that we are meshing together two highly advanced bits of kit and sometimes it just doesn't go as planned.
You noted that you are hoping to get a Samsung. I'd say that as long as you get one that is known to work well with your drone kit, chances are good that you will not have an issue.