1TB HDD is minimum requirement to run a node. SSD is superior. But SSD is more expensive.
For the price of a 1TB SSD, you could buy 4x used 1TB HDDs and run a RAID 10 on them. Then, you'd have 2TB of usable space. One drive can fail and you still have data integrity. And the speed is doubled. So if each HDD does 100MB/s, your RAID 10 does, 200MB/s. Which is about the same speed as a bottom-tier SSD.
No, it's not the same speed, ATA SSD goes above 500 MB/s and NVMe goes even faster.
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