On the netgear vs synology thing, I can't comment directly on the two models above as I have no experience of them.
However, I used to own a pair of 4 bay netgear nv+. After a while my second unit started having issues. Started an RMA with netgear and a replacement unit arrived, I kid you not it looked like it had been thrown down the stairs. It was also an older pre-netgear buy out model. Netgear response was pretty much "yeah and? We often ship refurbed units". After arguing with them for a while I rejected the unit, cancelled the rma and fortunately the retailer took it back for refund. I sold the second unit shortly after.
At work we have a netgear rack mount for junk that doesn't need regular access etc and it's always having bother with data consistency (drives are 100% healthy). It's about to get swapped out for a synology rack mount.
When I got rid of the nv+ I replaced them with a synology ds1010+ and while okay maybe there's a bit more plastic in the build but it's night and day in operation. Had some experience of their support too, when I expanded into drive bay 5 I started having I/o issues, logged with their support and arranged for them to dial in. They diagnosed a faulty back board and RMA it. Brand new replacement arrived, restored config and away I went.
Reliability, performance and support are squarely with synology.
Power bricks are power bricks. I've lost count how many LaCie bricks have died at work.