For me I find hCaptcha harder and more ambiguous than what I have experienced with reCaptcha.

The ambiguity might be because my phone is set to Japanese. I got asked to identify 電車 (Densha, electric train), but there were also images of diesel train. Is it translation error, or is it really asking me to identify electric train? (The correct term for train in general in Japanese is 列車 ressha)