B&W all the way. In the colour you've lost detail, the greens are too similar. In the B&W it shows up more detail. I think you've done some other editing at the same time as converting to. The second one looks like an old film shot. I like it.
Thanks Ferny I did do a bit of dodge and burn on the second...which is why it needs more work. I converted using a channel mixer layer, but there were parts a bit too blown out...