Keep in mind you asked the question . . .
I really wish I had more time to offer a more thoughtful response . . .
It is interesting to see both images side by side, and both in b/w and color.
My first thought is that I would recommend for you to print out all of these images (b/w and color) and hang them on a wall where, in passing you see them everyday; live with them for a while before you make a decision.
As for my opinion, keep in mind these are just our opinions, it is so subjective, and each with our biases or preferences. I have always preferred b/w prints, but I have been photographing a little more in color with fairly exciting results.
The first image, in all honesty, I think works either in color or b/w; it just depends what kind of mood, atmosphere, feeling, or perceptions you want to portray. The b/w in this image has a very classic, yet modern feeling to it, while the color emulates that of some of the early colorists (Meyerowitz, Sternfield, Shore, etc . . . ). So, I think it is your call as to which one is your preference, vision, mood, feeling at the moment.
The second image really speaks to me more in b/w. Maybe it is the historical reference of the flat iron building in relationship to the photo successionists, and that building their photographic icon for their movement.
In this age of digital; it is amazing how you can easily seem to convert back and forth to one or the other, and actually make the decision later, which in some respects just doesn't seem right. Yet, this is the freedom or liberation of all of these choices because of technology.
This is one of the reasons why I just prefer to photograph using film and making the decision at the time I am photographing. The irony, though, is that sometimes I have two cameras, one loaded with b/w and the other with color, then I decide after I see the images, which set to use.
Too many decisions to make . . .
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