Then it's the other way around, the EVGA model is way too cheap. Seasonic one seems reasonable considering how rare fanless models are compared to those with fans, but I dont care about fanless or not myself.
You never know what heat and load the PSU were exposed to in their former life...
A 1300w PSU will be under very low load, meaning very inefficient.
I don't know EVGA, but Seasonic is a great company. I have a 400w Seasonic fanless unit with Platinum efficiency. Even under heavy load it is very cool. Do you know what case it was isntalled in? The fanless units need to be in a bottom mount so they can convect warm air up into the ventilated case. They really don't like to be top-mounted. the former owner also could have installed it the the wrong way.
in some sense, a PSU with unknown history is like wearing used brake pads. That PSU can be near EOL, or not.