6 weeks of backpacking: Indonesia vs South America

We are a 27 yo couple who are looking to travel for 6 weeks from mid-June and all of July for our honey moon. Given that we have 6 weeks to travel, we are torn between Indonesia (including Borneo) and South America (Peru, Colombia +/- Ecuador or Bolivia). We would love to backpack around these countries but unsure where to go in this period of time!

Any advice to help our decision would be much appreciated!