Which Sign Up button shall we use for our web app to get the most sign-ups?

We want to improve our sign up button. In this set of images below, which do you think should give more clicks for people to sign up?

To give everyone brief info of what MYCURE is... MYCURE is the Most Complete Clinic Management System in the Philippines. It is a web and mobile application that aims to make Clinic and Hospital operations faster and more efficient. Kindly visit https://mycure.md/ for more information.

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My bet is on the second photo. Although the last photo is good enough to catch attention, I am worried about the imbalance in the aesthetics of the site.

Thanks.

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