Both are around the same specs, IR Bullets normally a little better than IR domes though, for outside and IR, in fact I would never use an IR Dome personally. But to each their own. Samsung GVI is hardly an upgrade though. Whoops my bad its the other way around
Anyway, domes are typically not as weather resistant either. I dont know the location or the reasoning behind them selling you IR cameras to begin with.
The Resolution on that dome is slightly off, should be 811x508, but perhaps that is the PAL specs? The Lux spec is incorrect also, most likely faceplate if anything, just an overzealous marketing team.
Either way, the specs are about the same on both of them, how they work though I have no idea as Ive never used or tested either of them. Specs actually rarely tell the whole truth.
As for the DVR, no idea, but best thing to do is try and plug one of the cameras into a TV and see what the quality is like that - thats composite video, if the cameras go into a DVR then out to an LCD the video is being converted from composite to VGA and that can very well look awful.
