So, would list why you think XBL is superior now? I honestly want to know.
I'll offer my opinion, but I won't console warrior my way to banishment.
XBL used to be superior. It is still good, but no longer the dominant one it once was.
I think what Marley meant was that stable online and party chat are not advantages because of the two consoles sharing those features. No comment on this...
Personally (and I mean personally), since the March XB1 update, I've found the XB1 party to chat to be just as good as the 360's. I guess in an added plus, the voice chat sound quality of the XB1 is far superior to that of the PS4; a minus for MS in this department though, the PS4 does not require any sort of additional attachment for the use of a third party headset- this is awesome in my opinion.
The free games and discounts are somewhat subjective; I don't argue this sort of stuff because I personally like the offerings for PS+ more, but find the exclusive discounts pretty even.
Paywall sucks. Plain and simple.
Overall from past gen I'd had a more pleasant experience with XBL than PSN. Now though, the two services have their ups and downs. The great constant updates for the XB1 as of late have certainly shown me that there is definitely someone listening to the complaints and actually doing something about it.
But the additional rentals/free psn library certainly gives the edge to Sony. I really hope the two continue to learn from each other and build off of each other because it can really only lead to a better experience for gamers.