Per an FFT analysis, Tracks 1 and 2 have the most low-frequency content.
Track 2 has the most.
Track 6 has the least.
Tracks 3,4,5,7,8, and 9 are all practically identical to each other, with less bass than 1 and 2, and more bass than 6.
The difference at any given frequency between Track 2 and Track 6 is roughly 0.3dB at the most. Many folks might argue this difference should be imperceptible.
A/B'ing the first four bars of Track 2 against the first four bars of Track 6, blind, I've been able to correctly identify as "having more bass" the one that the FFT said had the most bass, which is Track 2; I'm up to 7 correct guesses out of 8 at this point.
I have an infinite loop playing, and I know which track is the first half and which track is the second in that loop. I let it play for a minute or so, without my earbuds in, with the screen off, so I have no idea where it is in the loop. Then I listen long enough to differentiate which has a more full bottom on the kick drum (I found it easiest to identify the bottom of the kick in its relationship to the attack of the kick) and say "this is the thin one" "this is the heavier one" as it switches back and forth, until I can bring up the screen and verify if I have it right. I'm at 7/8 right now, so I have a good amount of confidence in these results as "not just lucky guessing".
As far as which sounds best or worst or whatnot, I can't get into that because I have nowhere near a reference-quality system to listen on right now.
Based on Steve's assertion that he could hear a difference, and that the difference included more bass on the analog tape, I will posit that Tracks 1 and 2 represent the analog tape.
Scott