Definitely play Resident Evil 7. It's fantastic. As for your point with your console argument. Perhaps it's just me being a huge Capcom fans for years, but had this debate took place even half a decade ago. I don't feel like there would be much of a debate to being with as it was something that was brought up in consistent manner in many online gaming communities back in the day. Especially in the 6th gen Capcom's exclusives were pretty much always above their multiplat games. This also tended to be true for gen 7. Here in now with Gen 8 their exclusives aren't so hot, but asides from Resident Evil 7 and Resident Evil Revelations 2.... how many games of a high caliber quality did they release? Multiplat or not. I would argue that the answer is not very many. Some will even debate Revelations 2 because the game was on a tight budget, but for what it was. Storywise and what not, it's one of the best Resident Evil games in my opinion. It mixed up the older atmospheres with the newer style of gameplay and created a very intense and even emotional story, despite it being more targeted to the more die hard Resident Evil fans. I mean it does reference older plot points from RE5, RE1, RE2, CVX, rev 1 along with easter eggs and jokes from all those. Resident Evil 7 on the other hand has a much broader appeal for standing on its own and having more subtle connections to the overall RE universe. It's still very much connected as much as people like to deny it. Some of the documents you find may even tie into a mysterious element of RE2, but some of the details leaves room for speculation.
I didn't mean to disagree entirely with your premise. There's a valid argument to put when one says that exclusive games for one console have better chances of getting better optimizations, and for sure, some of Capcom's best games are also the ones that started as exclusive ones, such as the Ace Attorney saga or the Resident Evil REmake. I'm just saying Capcom's greatest isn't limited to exclusive games, and sometimes they're able to pull amazing gems while designing for a multiplatform release; so while it's true that Capcom's quality has taken a big hit in the eight gen, and they don't seem to properly get out of the hole they're in, the possibility of DMC5 being amazing is there regardless of it being exclusive or multiplatform.
And I absolutely loved Revelations 2. Mostly because of the Barry fanservice, but it was long, fresh, it had quite a lot of interesting and challenging sections and a shit ton of extra content to enjoy. Certainly a great game despite its shortcoming.