Having worked at companies that do both, I prefer the explicitly accrued/yearly allotment. There's less of "I'm back in elementary school and need to raise my h

Having worked at companies that do both, I prefer the explicitly accrued/yearly allotment. There's less of "I'm back in elementary school and need to raise my hand and ask permission to use the bathroom" and more "This is my time, as long as I'm responsible I can use it essentially whenever". And that's with the previous unlimited time company actually being fair with it, I can't imagine how difficult it would be to use with a company that discouraged it.