With them going back farther, you could argue that the older the game is, the less value it has to the market and consumer base. You can chose to look at it however you want, so of course you're gonna go with the version that makes Xbox look better.
The difference is almost certainly in marketing. With Xbox it's everything because it's all they have. They push it at every new game reveal, every event, every commercial. I keep forgetting PSNow even exists half the time because Sony doesn't focus on it. Sure, I will concede that Gamepass is the more popular of the two services, but it's still a clear case of 'if it mattered as much as you say, PS4 wouldn't be outselling Xbox like 4:1 every week'. Gamepass is good. IT's better than PSNow by most metrics, this is clear. but to dismiss my stance of them being similar and Xbox not pulling ahead despite their better service? Naw, don't try to pull that narrative because Xbox is doing better in one category out of like 12.
I've never said GamePass is bad, but PS has a similar function, but people on PS don't bother with it because they have too many exclusive titles to play that aren't on it. Clearly this business model is working if PS4 is still doing so well. Gamepass might actually be hurting Xbox in the long run, as it gives people less incentive to buy games.
Seeing as PS4 got the lions share of marketshare, it got a lot more filler and shovelware to make up for that 1000 games gap of BC within the same gen. Where as plenty gems from the PS3/360 era are only BC on Xbox. Sure we are both parroting the strengths of our respective console makers, but going 2 gens further back certainly means something.
At least by omission of reply you acknowledge just how GP has been pulling away from PS Now, keeping in mind years of release for each as well as console install base.
Bold: Thats what Steam is for. There’s your short term revenue, in combination with Xbox gamers still buying outright. Remember, it’s an ecosystem not just one console doing everything by itself.