From logo concepts presented here, I would prefer the latest with the PP on top of each other. About the couple coins in that candidate, the middle one of those looks better than left. That's probably the higher contrast between leaf colors and background/text. You could try playing around with little darker shades of green on those most light green colored leaves. That might make left one look as good as middle one. Maybe even more presentable as there would be basically two colors yellow and green, instead of multiple shades of yellow. I don't know whether gradient has effect as well, since its present in the middle one but not on the left one. I guess comparing them side by side would help.

It seems we are restricting ourselves with the design of the actual coins that have been used for thousands of years, which is natural. I don't think there any reason to diverge too much from the original concept since its familiar to everyone. Just wanted to give your creative minds something to think about. However, coins have usually been of a single color and many cryptocoins have followed suit. This does not have to be the case in this time and age and with this currency technology. After all, coins with digital money are not made of a single precious metal.

Since coins have been made from precious metals, images and texts were presented by engraving them. What would these coin candidates look with little bit of depth perspective included in them? Similar to the pandacoin right there, it looks like it has "depth".

I think it might be difficult to find good balance between simple and detailed, but wasn't this thread made to do trial and error