The difference is subtle but it's there, and this is at moderate sound in my home office. At gig levels, the differences are likely more pronounced. The 115 has a bit rounder tone than the 210, but the 210 cuts more with it's voicing.Nice recordings, I don't think there's any way I'd be able to hear a difference in a mix
I bought the 115 first, then after a year or so found a deal on a 210 from Guitar Center used, which is nice since I could return it within 45 days to my local store. Spoiler, I did not return, the combination if the 115 + 210 is best of both worlds, with the 115 on bottom, 210 on top, which makes it great for stage volume having the 210 closer to your ears.
If I had to take 1 to a gig, it would be the 115, but if the gig is big enough, both cabs together are greater than the sum of their parts.