In 99.9% of cases, you should never need to touch DNS. Your ipad should get proper DNS settings from DHCP where it gets its IP address.
If it’s really running faster, that would indicate that Ben’s new site hasn’t propagated to your default DNS server and the site is taking a long time to load because some secondary DNS server is resolving the address for you.
Technically, there’s nothing wrong with using Google’s DNS servers (8.8.8.8) but it’s extremely rare to have to do so.
I’m an IT consultant by trade, so if you need some help with this, please feel free to reach out.