If I was going by looks I would say the Chinese Panda. Beautiful coin, and I love the 2013 design. But for stacking, I like the Perth Mint coins. 1oz kooks and lunars for their semi numismatic value, as well as a couple of 10oz thrown in there and 1kg coins for there low premiums. The ASE's are really nice coins, but pointless to stack, there are so many of them and the design is always the same. Might as well stack bars if stacking ASE's and be able to purchase more silver. Libertads also look nice, I am yet to purchase one yet.
