DELTA 3 Plus as UPS for PC

I want to buy a UPS for a 650W load (PC + monitor) and currently, I am between the CyberPower CP1600EPFCLCD and the DELTA 3 Plus power station: I lean towards the latter. My mains is relatively stable (220-240V the entire time) and just want the option for a graceful shutdown rather than operation for the entire blackout.

At face value, I would prefer the power station for being a more "modern" design and it seems more reliable than a UPS with lead-acid batteries. However, it is double the price (750 euros for the power station vs 400 euros for the UPS) and want to be certain the power station can serve as a UPS before dropping 750 euros. At least on paper, with a <=10ms delay it seems possible.

Does anyone else use EcoFlow power station as UPSes? Did you have this conundrum of getting a UPS or power station in the past?