If by TEFL you mean Teaching English as a Foreign Language, more important than going to either place, is to improve your English. If you say things like "an TEFL teacher" no one will give you a teaching job no matter which school you attend. Once you've done that, you can think of the next step. As for TEFL/TESOL courses, it doesn't matter really where you take the course. Make sure you get your qualification from a reliable center. Two of the most prestigious certificates in the field are Cambridge CELTA and Trinity TESOL ( Trinity College, London). There are hundreds of centers around the world which offer courses leading to one of those certificates. Even more important than your certificate, however, is your teaching skills and your awareness of the language you are going to teach. Good luck :)

Hola!. Voy a darte unos datos que pueden ayudarte en tu decisión: Bogotá es la capital de la República de Colombia. Colombia tiene aproximadamente 45'000.000 de habitantes y Bogotá, tiene 8'566.926. Es la tercera ciudad mas alta del mundo con 2.625m de altura, después de La Paz y Quito. Tiene muchas universidades entre las cuales se encuentra la sede principal de La Universidad Nacional, que es el mayor centro estatal de educación superior. También se encuentran: La Universidad de los Andes, Universidad del Rosario, Universidad Jorge Tadeo Lozano, y sigue una lista muy larga de centros de educación superior. La cultura es algo muy importante en Bogotá, como que ha sido llamada "La Atenas Suramericana". Es la ciudad de las oportunidades y recibe a todos como ciudad cosmopolita que es, con gran amabilidad.

Okay thank you! I understand what you meant now. You were correcting my English! haha

I think both places are beautiful and offer opportunity and most importantly almost share the same cultural aspects. However, I know more people that have been to Peru more so than Columbia.But look at what you want or what you are looking for. Such as, city, rural, cost of living, salary, contract etc......

Also, instead of TEFL teacher you could say " EFL teacher". Good luck with your course and your teaching!