I also picked these two.Playback device = Maxed out Alienware
1a / 2b
1a = sounds more organic. 1b seems less refined and a little more subdued and straining to reach the natural portrayal of music as exhibited in 1a.
2b = ditto
(Note: the difference in my perceived listening impressions are that 1a and 1b are closer in sound qualities with 1a edging out 1b. However, I feel that 2b is vastly more organic and natural sounding with less strain compared to 2a.