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I think 3.5" are usually priced better per tb than 2.5" drives and performance is usually better too. So unless you feel like burning money for an inferior solution, are have some space constraints that doesn’t allow 3.5" drives, I wouldn’t go with 2.5" drives. They’re more energy efficient though, but you’d need a fuckton of drives for that to make a worthwhile difference in your power bill.
It’s not dependent of circuit, things just need to be on the same phase. Our house uses three phases total, so power line adapters only work for 1/3 of the house here.