The SG350 is probably going to be cheaper if you only consider the capital cost. The Meraki MS120 may well be cheaper if you consider the ongoing operational cost, such as keeping the firmware updated, monitoring, off-device configuration backups, etc, ... All current Meraki PoE switches can deliver 30W of PoE. However note that their is a maximum PoE budget, and some switches can not deliver 30W of PoE on every port at the same time.
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