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What's the difference between "disk.device.write.requests.rate" and "disk.device.iops" ?

I would like to get the IOPS value from each instance, so I searched some info about Gnocchi metrics, and I found two metrics: disk.device.read/write.requests.rate and disk.device.iops.

According to this page, disk.device.read/write.requests.rate means "The number of read/write requests" per second, and disk.device.iops means "Average disk iops per device".

My question is: what is the main difference between these two metrics? I can't find out which is the most suitable choice for me.