I have been completely unable to find a reasonably featured Windows reader since Nexgenreader stopped development. I deleted my Windows install on my 2-in-1 to get Newsflash in Linux instead. I also saw Feedreader in the repository which looks promising, but I haven't tested it yet. On Android I like FeedMe, but there are other good options. On iOS I am all-in on Reeder. I use Miniflux as backend (I pay for it so I don't have to bother with hosting myself) so I can mix and match any client that can connect to that.