Why not get a few uSD cards and try the others.
Each OS has features that are unique to them.
I use 3 normally, PiCore, Raspbian, Gentoo64 and baremetal with Ultibo.
My others are Buildroot/MotionEyeOSand Raspbian Lite/Pikrellcam for my Security cameras.
Those last two have probably more hours of use as they are fixed 24/7 cameras since 2014.
Pi's do not limit you to any OS, you can even make your own as the Baremetal guys are doing..
Personal choice depends on what you want to do with your Pi or Pi's.
Raspbian is still the best place to start, but even that is evolving and there are now 32/64 bit kernels to confuse things.
Ubuntu is coming along, Arch has been around for a long time.
Raspbian is Debian based so it goes for solid/stable.
I am doing OpenGL and find Gentoo64 generally has newer OpenGL drivers, but it can be behind on Raspbian USB/Ethernet drivers.
I like Gentoo64 as I can compile the source to the latest version when I want and not have to wait for a new Raspbian release.
Arch is similar, it depends on your Linux skills as these are all very different.
Most tweaking is done in Raspbian and it trickles across to the others.
Another year's time and there should be many more to pick from.
If you have a server, one day you could netboot and have a choice of OS's to boot up
I'm dancing on Rainbows.
Raspberries are not Apples or Oranges