Difference between separate admin/standard user and admin with UAC/passwort prompt?

I just installed Windows 10 on a new PC and was wondering what is more secure. Assuming UAC is enabled on the highest setting and I'm the only one using the PC.

• a separate admin and standard account who gets prompted for the admin password if he wants to perform actions that require elevation
• an admin account with local security policy changed to prompt for a password instead of just confirming

So in both cases I'm asked on a secure desktop to provide the admin password if elevated rights are needed. Is there no difference in terms of security?