Next week, June 1st, the newest version of TeX Live
will be released. TeX Live 2017 has been thoroughly tested, issues and fixes have been discussed on the tex-live mailing list. That's a good opportunity to install a new TeX distribution. After the release, updates to TeX Live are available via CTAN.
TeX Live is maintained and backed by the international TeX Users Group. And it runs on Windows, Linux, Apple Mac OS X, and more Unixes. Since it comes from and with the Unix world, it comes with a lot of small tools.
I used MiKTeX many years ago, when it had a package manager and TeX Live did not have yet one. It was easier to install and to update. That changed in 2008, since then I am using TeX Live. I cannot say much about MiKTeX as a non-user. The MiKTeX distribution is the work of one man, so it mainly depends on him and his time.
There is a review of Joseph Wright, one of our moderators: TeX on Windows: TeX Live versus MiKTeX revisited