The look and feel ('uniformity') is more a matter of what desktop environment you want to run rather than Distro (though that can matter too). Choices include:
* Gnome
* KDE/Plasma
* xfce
* Elementary (but to muddy the waters a bit, is also a distro around their DE) - This will probably be the closest to MacOS in terms of L&F
* Budgie
* Enlightenment
* And others (more niche (low ram etc))
* Plain ol' X11
A lot of distros are opinionated and ship with a default DE (eg Ubuntu/Gnome) but you can generally can install what ever you want. Some (Arch, Gentoo) are not opinionated and let you configure it as you see fit.
If you've never installed Linux, I would start with Ubuntu as there are lots of guides on it. Ubuntu is derrived from Debian.
If you're comfortable with the command line and making more choices Arch is a nice distro (and really isn't any harder than Ubuntu, just different - the arch wiki is very good for docs).
(edit: Formatting, typos)