This is under the control of the site with hCaptcha, so you'll tend to see more variety in difficulty levels depending on their settings. There will always be

This is under the control of the site with hCaptcha, so you'll tend to see more variety in difficulty levels depending on their settings. There will always be some individual variance, but when we've tested this people always solve hCaptcha faster than reCAPTCHA on average. (disclosure: work there)