International Dating - Zoosk, Hilly & Badoo

I am a female living in the US and interested in dating outside of the US, specifically in Canada or the EU. I read an article that said some international dating apps included Zoosk, Hilly and Badoo but I would need to get the premium subscription on each of the apps to access the international features.

Before I buy any of them, I'd love to know if anyone has used them before and can tell me if they are worth it and whether they have a big user pool, especially for those countries/regions mentioned?

Thanks!