Celeste,
I think the 1st machine is a Singer 27(long bobbin), the 2nd one is a Singer 115(it takes a round bobbin class 15). I personally prefer a treadle machine over a hand cranked one for daily use. Both are pretty machines, I think that the Singer 115 might be in better condition; the cabinet is beautiful.
A Singer 66 is the machine in my avatar picture.
Sharon W.