You ask a carpenter what his favorite tool is? I like languages that are fit for purpose, and I enjoy using them for that purpose.

I used bin/bash when I automated the backups at work and happy doing it. I was pulling my teeth out when I had to write code for communicating with Bluetooth devices in /bin/sh because that was what was available from factory on the router.

I picked Python for when I needed to scrape a Romanian phone book (to win an argument on the internet about something completely unrelated to programming). I once tried doing parallel programming and threads, it did not work out very well and I switched to some other language before I got too deep into it.

My guilty pleasure is the voodoo magic of C. I don't really have a use for it in my job so I never get around to really do anything with it.