Assuming this article know what it's talking about, which it seems to, I'll be in a good position with either. They say that a good bit per pixel (bpp) is 0.1 and that going above this won't produce a significantly better image. To figure out the bpp, we want to take the bitrate and divide it by the total number of pixels per second. Doing the calculations we find:
1920*1080@60p (28Mbps)
(28 x 1024 x 1024) / (1920 x 1080 x 60) = 29360128 bits / 124,416,000 px = 0.23598bpp
OR
1920*1080@24p (24Mbps)
(24 x 1024 x 1024) / (1920 x 1080 x 24) = 25,165,824 bits / 49,766,400 px = 0.50568bpp
Both of these bpp are well above the 0.1 "very good quality" standard. To me that means that each would be just fine. The article specifically says that your increase above the 0.1bpp won't result in significantly better quality, but I can't help but imagine I would get a better image from the 24p version which has over double the bpp. I suppose that will be a test for the field. In the long run, if the video is acceptably good quality at 60fps, I will choose that, simply because I can limit the fps in post processing and with 60fps I can also use some slow motion effects.
Thanks again for you help kenrivers!