Chile's fjords are both spectacular and very messy, whereas Argentina's coast is pretty neat. At similar latitudes, you see the same thing in NZ, where the west coast, or at least the southern part of it, is a jumble of fjords and islands, whereas the east coast is largely straight. Same also goes for the Antarctic Peninsula. I don't know if that's all a coincidence, or there's some reason for it.
It's funny, a much larger portion of west coast are highly irregular compared to the east coast. Canada's Baffin Island is the most substantial east coast fjord field, and China's coastline is pretty irregular. Southern New Zealand, Southern Japan's Kyushu Island, Australia south of Darwin, Thailand, Norway, northern part of British Columbia, Scotland and Ireland all display the trend of irregular West coasts. Africa is really the only continent spared from the phenomenon.
Man, I remember when I first saw my grandfather in the hospital, he told me to never forget him. I never have. His memory will forever be in my heart till the end of time. After his death my father had taken up alcohol. He then became addicted, heavily. One fateful he went behind the wheel and crashed into a Chevy Silverado. Everyone including died on impact. The last thing my father said to me on this terrible was one thing, "Don't ever forget the Bahamas." And for this reason is why I got the 100% my father would have always wanted me to. I pray that his soul is laid to rest after this.
I'd have guessed Ecuador before Peru in fact, even though it's much smaller, although looking at the source Peru is [just!] ahead of Ecuador.
Colombia and Venezuela are more jagged, especially in the Caribbean, and have a lot more islands (about 75 and 300 respectively).
Chile is the Norway of South America, especially in the south where you can't move for all the coastline...