Comes down to preference. What do you think is cooler nostrplebs or runningnostr? You can create a NIP-05 identifier of your own if you own the domain. Like @jack did with his cash.app domain. He is able to verify it's really him and not an imposter. The @saylor account isn't verified by any of his known domains such as hope.com or microstratey.com and is most likely an imposter.