PicoPSU vs. Built in ITX DC to ATX

I'm currently considering two case options for a box that will be a low power build (<60w)- one is the Antec ISK110 that comes with a 90W power supply, which goes for $78 -

https://www.amazon.com/ANTEC-ISK110-VESA-U3-MINI-ITX-Mount/dp/B0095P21ZS

The other is getting a cheaper case and buying a picoPSU -

https://www.amazon.com/MITXPC-MX500-Industrial-Mini-ITX-WallMount/dp/B01B575EMA/

http://www.mini-box.com/picoPSU-80-60W-power-kit

However if you sum the costs of both ($40 for the case, $35 for the power supply) it comes out to $75, roughly the same as the Antec

Which is preferable? Are there any other options for a cheaper version of a PicoPSU?

Thanks.

Nice question. I read about something called HDPlex . Basically all depends on the configuration you are going to build... I have a Small Built project and personally i am considering the way of the internal PSU (Flex ATX) . Have a nice day. Thanks