Depends on the laptop - my last one was loud and had average audio, but had HDMI out. Current one does not have HDMI, but I use a USB DAC and sound is acceptable and it is quiet, but still gets hot. More often than not, I don't like to use it for music though.
It does matter. DACs do play a role, so if the player's analog section is better than your receiver, the player via analog will sound better. How much better is hard to say. I had the 83 and it had good analog performance. When I upgraded it to the 83SE, the analog performance jumped quite a bit and is still actually better than the UMC-200. The 103 may be perfectly fine sound wise, but I'm going to have to expect the 105 to be a step up from it. So it sort of depends on what you're after. I feel my Panny BD-65 has a decent analog section and have no complaints about it. It isn't nearly as good as my 83SE, but I don't feel short changed when I listen to the Panny because it is good enough. So it is a matter of what you are OK with.
I had my Denon 2900 for years because it was a great universal player. When I got the 83 upgraded to SE, I sold the Denon.