I believe I'm using Twenty Sixteen, but since I'm building my whole website with Elementor, it's completely custom.
I can highly recommend Elementor. It's a visual builder and comes with both free options and a paid version (which you pay a fee for per month, but once you cancel your subscription you're still able to use the Pro features you had access to before.. you simply won't be able to use any new stuff they release). The fact that it's a visual 'building blocks' plugin makes it sooo much easier to get the website to look how you want it to. And of course there are also templates you can use if you don't want to spend time designing.