Don't discount the difference both 10psi and 10+ degrees make. Yes, I'm sure the first will fit your needs fine, but the two should perform appreciably different.
I've only ever used a continuous fill machine, so I can't comment on refill frequency and how often you have to wait 20+ mins for the unit to cool.
I've only ever used a continuous fill machine, so I can't comment on refill frequency and how often you have to wait 20+ mins for the unit to cool.