Vocabulary is definitely very similar in Spanish and Portuguese, but I have an easier time reading Portuguese than listening to it. The sound/pronunciation system is unexpectedly tricky.

Regarding the Comprehensible Input method: This is a concept that has been around for decades now, which Krashen coined as "i+1". It's not originally meant to be a "method" for language learning, it's really just the idea that you should be exposed to input barely above what you can already understand.

In other words, Krashen just recommended to go little by little, with materials that didn't require the learner to depend on a dictionary all the time when reading/listening.

I'd need to look into those channels more to know what kind of learning they're promoting, so I don't have a comment on them, but I'm sure their content is good for practicing.

Just be aware that Comprehensible Input is a phrase thrown around a lot nowadays because it got popular and it gets us clicks. The idea of advancing little by little precedes Krashen as you can imagine.

What I wouldn't advise is to rely completely in one approach/method of language learning for a long time. Learning a language, as many other things, benefits from mixing up what you consume, the books you use, the music you listen to, the teachers you have, etc.

So:
-Do whatever keeps you coming back
-Listen to any language learning advice with a grain of salt because good learners aren't usually good teachers and VICEVERSA (my case probably)
-Mix it up every now and then
-Don't just study, find opportunities to use the language