Will Halo infinite perform better on PC or Xbox Series X?
If they do a good optimization job obviously PC. The better experience however also comes with a heavier entry price.
We know the series X is going to be 120 fps, so I just want to know if it is even worth getting a PC anymore if that's the case.
It depends what YOU want. If it's just for gaming XSX might be enough, especially because it is a really nice setup for the price they offer and it's still in the realm of high end gaming! But it can't compete with better CPU, more RAM, RTX 3000 series and so on... That's a given mate. XSX can go up to 120fps (Hi for now is planned to reach that target as well), with better hardware you can can above that with more complex geometries, higher res, better raytracing and faster loading time.
To beat this gen consoles in 2020/21 you need to spend relatively a lot though, especially this time - because XSX is actually a good starting point contrary to Xone/PS4 FAT back in the day. Once paid that "heavy" entry price though, services and software will cost a hell lot less, you get a much better multimedia station, you get access to mods and have a much bigger pool of games than any other platform - all for less than on a console. So in the (very) long run you might safe a buck or two. So "heavy" it's relative to how much you play and if you only use for gaming or more. It's a lot more work though! Especially if you want to make the tower comfortable for living room and 4k TV ready set-up!
Personally I travel a fair bit, draw a lot, work in the architecture/3D field and consume a lot of YT/Netflix. So I'm better off with a laptop! 🤷🏻♀️ I even got a Quadro over a GeForce, because I don't care much for framerate in single-player, it's much better for everything else I do and I still get enough out of it to play well R6S. I did spend more for an awesome IPS screen though, because colors for me are important in everything! See what I mean? So if you want a better answer to your question you should also provide more infos about your your preferences! :) XSX is not the best hardware you can play games on objectively speaking, but it gets close enough! So if you don't care for mods and would use the rig for gaming and nothing else, XSX is still the best choice for multiplats imho!
Long story short (again): it depends what YOU want. There is no right answer!
Also will MCC perform better on the series X as well than on xb1?
Yes, better framerate at the very least!^^