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Colombia is the way nicer country than Ecuador in my opinion and most of the people I met, but stick to one county if you only have 5 weeks. Also Colombia is cheaper.
Ecuador would be my pick and I would definitely spend the entire 4-5 weeks there. My wife and I spent a month there in 2018 and we easily could have stayed longer. We started with a week in The Galapagos, then 2 weeks in the mountains ending with a week seeing the Amazon from Coca. I've visited the Amazon 4 times now, from Iquitos and Puerto Maldanado, Peru, Coca, Ecuador and Leticia, Colombia and Ecuador was by far the best.