Thanks, will do. I am not looking into newer OSes becuse of some certain features, mainly becuase of app compatibility. So thats why the newer the better. I want to use this mac for some time, with enough compatible apps.
Ok, so the time has come for me to decide which OS to install.
I have looked at the minimum system requirements for most of the apps/apps i am interested in in the App Store, and apparently it is either MacOS 11 most of the time or on heavier apps like Final Cut Pro 12.6. Now, the thing is that i am not planning to run something like FCP on this mac because it will not handle it, at all, but i am planning on running simpler apps like the latest versions of "essential" Apple apps, like Notes and Pages, and even for that you need at least 12.6. I want to occasionally run something like iMovie or Garageband, but mostly essential apps and utilities, as i said. I 100% am planning on/need LibreOffice, but that can also run on 10.14, so thats not a problem at all.
The biggest issue is the gpufix, because the current gpufix i use, and love, MBPMID2010GPU_Fix by Julian Poidevin is not going to work on versions of macos higher than 10.14, but the alternative to it, Mid-2010-GPU-Panic_Fix by Fabioiop, will work on higher versions of mac os than 10.14 but only up until 10.15, which is not ideal, at all, but some users have got it to work well on versions of mac os even up to Ventura, but its a hit or miss as you said before.
However, aside from that, which OS should i install? Let me go down the list:
-Mojave: bad app support
-Catalina: better but still bad app support
-Big Sur: good app support but not great and "too old" as you say
-Monterey: great app support, for now, and no downsides
-Ventura: even better app support, but not very stable yet with OCLP (the only way to install these new OSes on my old mac)
-Sonoma: a patcher hasnt been made yet by OCLP or anyone for old macs, so thats out
I think its obvious now to me, and agree with your choice to go with Monterey, that Monterey is my best option, and that the GPU fix by Fabioiop might just work fine! And if not, well, so be it, i still have good ol High Sierra on a usb installer in case i need it.
Now, the last thing is: App backup. I spent some time dowloading and installing all of the compatible apps i need on my mac with the OS i have on it now (HS), and dont have a lot of time to do that again, and spent a healthy bit of internet on that, which i pay for, and is only ~90GB, not unlimited, and os i want a way to backup all of the dmg files of all the apps i installed on here on the current OS, so that i dont have to use up data and time downloading and installing them again for no reason if i can just back them up. I think the only and most reliable/best way to do that is to move all of the 291 app dmg files on the current OS onto my half full 256GB usb stick before the installation process of the new OS, and then after the installation is done i move all of the dmg files back onto the computer and install the apps again. that way, i save a ton of data and time, with no downsides, and im not worried about app updates coming out while installing the new OS. i dont have any important files or personal stuff on the compuetr now, so i dont have to worry about that, and if i do i will just move them onto the usb stick together with the dmg files.
I think the installation steps to install Monterey are already outlined before, and i will refer to the OCLP website for that.
Thanks for all of your help, guys!