Their moat is good server hardware that can be ordered without talking to a sales person that has one goal - determine how much they can milk your budget.
They used to let you order without talking to sales, now they want to validate the config like Dell and HPE. They are slow and don't respond and their ETAs are terrible and often wrong.
They have multiple friendly, competent resellers who will happily quote their machines, often using online tools, and will often come in around half of, say, Dell’s price. Maybe even better if you want something ridiculous like disks in your machine.