[0] https://getfedora.org/ [1] https://spins.fedoraproject.org/
People generally don't fault MacOS for not supporting whatever hardware they bodged together, yet they expect Linux to work with anything because hackers and magic. I guess that's a good reputation to have but it's not very useful if you want something that just works.
In the case of Linux, what just works is generally the drivers that are built in to the system, with vendors that take an active part in Linux development. And since Intel started to make both network and graphics cards, that's usually your best bet. ATI is generally usable too, but performance and power consumption generally lag their Windows equivalent drivers.
With that said, it's quite easy to test. Download the latest Fedora (or Ubuntu) live DVD and boot it. If that works with your display, a native install is going to work too.
Just don't install Linux as an almost-Windows or cheap-MacOS. If you want Windows software then that's what you should run it on. Run Linux because you want a UNIX desktop and the kind of software that goes with it (gcc, bash, rsync, native TCP/IP utilities and those things).
With regards to your question about triple monitors. I mean, I managed to get triple monitors working on FreeBSD without much fuss so I am not sure of how much help I can be when I say "it should just work". I am obviously biased.
But, it's likely that it will just work, the open source drivers for AMD are significantly superior to the open source drivers for nVidia. Although I only have nVidia cards running and I have 2 setups with triple monitors.
The tradeoff is that the CPU half of AMD's processors is kinda bad - they are all derived from either Jaguar laptop processors or Bulldozer, they desperately need to be refreshed with Ryzen. So Intel has the better CPU but a mediocre GPU (unless you splash out for Crystalwell), and AMD has mediocre CPUs but a good GPU...
AMD's non-APU processors (FX, Ryzen, TR, Epyc) do not have iGPUs however, same goes for Intel's lines of server chips (X99/X299/etc). This is something that is only in "client" processors.
http://www.dell.com/support/article/uk/en/ukbsdt1/sln115952/...
As a data point, the development desktop I'm using runs 3 monitors on Linux (Fedora 25). They're hooked into a single AMD R9 390 graphics card (overkill, but it was hanging around spare when putting together the pc).
The monitors are 1x Dell 30" in the middle, with 2x ASUS 24" monitors (one each side). No HiDPI stuff, and everything works fairly well. Using the "Xfce" spin of Fedora.
Didn't need to do any complicated setup. The monitors were all detected fine without mucking around, and I just needed to drag them into position in the Xfce4 gui tool so it knew which one was on the left, middle, right.
My advice echoes others - you can try before you buy (install) with a few flavors of Linux; see what happens. If you have trouble, try to find a fellow human who can help - X is a little surprising to configure, if you haven't done it before.
But frankly I find the Gnome-Shell desktop to be beautiful. Maybe try Ubuntu-Gnome? [1]
That being said, the majority of UI animations in Linux are like that, so meh.
Stay away from Fedora and Arch unless you don't mind getting into some set up files. Personally it is fun getting things setup for me and so I enjoy Arch and Fedora and sometimes it they are just as quick and simple as OpenSUSE and Ubuntu.
Just my honest opinion after 15 years of continuous use in university and work.
XKCD still relevant today: https://xkcd.com/456/
I think for a lot of people who want to just browse the Web and watch movies, Linux is more than up to the task. And suit, recently even libreoffice is working fine for my simple needs for word processing and spreadsheet work.
Usability of Linux in the past 10 years has been exponentially increasing.
Ironically, Canonical is making money mainly with cloud services. Meaning servers - what Linux is good at.
and I wish this to be true for any *nix system.
The ability to venture down the rabbit as far as you want, without black-boxes.
I think a lot of us sit here today because of that privilege.
As someone who is the same boat but hasn't discovered Linux yet, how hard would you say it would be to install a version of Linux that support 3 monitors (using an onboard ATI card and a PCIe card)? Last time I tried installing it this is the part I gave up at.
Also as a person always been aware of Window I find the graphics in Ubuntu lacking some finesse, i.e. the scrollbars, window panes look like that created using Java applets (granted it is a matter of taste and personal choice) but what is the most professional looking desktop to try right now?
Sorry i know this is off-topic but I too really want to switch from windows and don't want to waste money in Macbooks so any advice would be appreciated.