Aucist Others give up, I insist
The registrars provide free DNS for the parked domains, why do I need to choose a third party DNS? Because once I tranfer my domain to another registrar, I need to input the records of DNS, it's very inconvenient. So if choose a permanent third party DNS, I need not to do this.
Although there are some inconveniences on the he.net free DNS control panel, such as all of the different types of records are placed together, they are not sorted. When you are used to use he.net free DNS control panel, probably it's not a big issue, because he.net free DNS is the only a few of available free DNS providers.
Recently, there were some unsteady times, so I suggest that input all of the DNS(es) of he.net, such as:
Usually, after the domain is transferred to another registrar, the DNS(es) of domain need not to change.