Pete, may I ask what models of Oppo and Sony players you are using?
I like to stay out of discussions about which player is best and whatnot, because firstly that depends and secondly I don't really care that much.
As long as a player is not super slow and plays back actual BDs and media files from the network, I'm happy.
I don't care AT ALL for copying discs, I'm not really sure what I would do that for, it seems to be mainly a German sport? At least it seems so from what I gather off the German forum.
I have the originals and some of them additionally as MKV on the server, what else would I need...
But: with Panasonic I had the worst experience so far. One had a super-super-slow CPU, waiting for a movie to finally start, tested my patience once too often and it went into the trash (well, no, it's still in the attic for occasional tests, but there's no real practical use for it).
Another had a picky drive from the start. It did read most discs, but only with an effort (an audible one - repositioning of the laser multiple times, delays, etc...).
Also, historically, Panasonic tends to be the brand with the most limitations and format problems (wasn't it also known for deliberately not playing DVD+R discs? I may be wrong)
Anyway, Panasonic is off my buy-list.