I have a Note 4 and can say I'm pretty dissatisfied with Samsung and customer service, as well as what is frequently a piece of crap phone at times, and other times an amazing phone that is utterly unmatched by anything else out there.
I think my biggest gripe with customer service is not having easy access to warranty support. Being able to walk into an Apple store and exchange my phone is pretty awesome. I know we can do that with phone carriers but sometimes it's a pain. For example, I outright purchases a T-Mobile Note 4 originally for use on ATT. When it crapped out I took it to a couple different T-Mobile stores, they all said they couldn't replace it because I had no account. ATT would replace it with an ATT model, but that's not what I wanted at the time. I ended up sending it back to Samsung warranty in Texas, between the shipping and the time they sat on it, it took about 2 1/2 weeks to get it back. When the replacement crapped out I had the same issue, this time I contacted T-Mobile corporate and bitched and they sent me a replacement. Don't even ask me the other 5 times my Note 4 had warranty issues.
I can't say that Samsung phone support has any winners either. I get some Latin American guy with a heavy accent taking me through a white sheet of minutia that has nothing to do with my issue, after an hour he says that I have to send the phone in.
So while I'm definitely a Samsung fan and not an Apple fan, I just don't see how Samsung could beat Apple in terms of customer satisfaction with the Note 4.