Jailbreaking iOS is actually even worse than not using iOS at all because jailbreaking destroys the "walled garden" security defenses that stop you from tinkering with your phone, there is a ton of malware written for jailbroken iOS that cannot run on normal iOS because it doesn't give you root privileges, whereas in normal iOS the only way to take over a device is to send a payload in a phishing email that exploits a browser vulnerability followed by a kernel vulnerability, and there are shady hacking companies (hackingteam) around that make it easy for anyone with a $2 million dollar budget to target someone with it.

Even the root password for the millions of iDevices in existence is well-known, it's "alpine" but Apple doesn't bother changing it because you can't get root access on iOS without Jailbreaking it, something they don't support only so they can have a leverage in security talking points for their marketing.
This means everyone who jailbreaks their iPhone and doesn't know better to change the password is already exposing themselves to attacks.

Rooted android has all the security issues that jailbroken iOS have. Which is why I recommend nobody use those devices for financial activities.