If I have to choice Python hands down because it can be async but is synchronous by default. But theses days there's Typescript so the choice is harder. I'm actually learning Ruby at the moment and I'm surprised how my perception of it was so wrong, so what I'm saying is it's easy to get the wrong idea at first, but once you dig in, you'll find a bunch of hidden gems in a language no one talks about. These little gems are what collectively makes a language good or not--it's not just one major feature, it comes down to the attention to detail.