The two on the front look the most attractive to me. Can you see if the Asscher actually reflects light in the centre? If it didn’t look so dark and mushy in the middle, I would vote for that one, the facets are stunning. But going by the pictures alone, I would go for the lightest emerald cut. It glows.
I would go for the top left, but that's bc I prefer lighter colored emeralds rather than "forrest" green. They are all gorgeous though! Do you mind sharing the vendor?
So in the off-the-hand photos I agree with others that the asscher shape is nice (second from right). But my personal favorite is still the one on the left (probably lighter than what most prefer, however). My favorite emeralds have a slight blue to them, so I love that one.
I like top left the best, because the color has more blue, and there is noticeably more light return compared to the others. If I wanted a vivid forest green, then I would rather get chrome tourmaline, jadeite or tsavorite. I only love blue-green emeralds because the color is more unique. I like the others, but probably wouldn't buy. For a pure vivid green I just know that other gem specimens are more durable, and I'd rather spend money on more durable gemstones, all else being equal.