To answer your question about tools...it really depends on what you are building.
Captivate is considered a good choice if you do software tutorials. And it can do really nice software 'assessments' where the user has to perform the action to complete. But I cannot say whether the software tutorials are especially responsive, I have my doubts about accessibility of software tutorials and building responsive anything in Captivate is kind of a pain in the behind. It is what I use (we are currently at war). Mostly we do software stuff. If you have a bunch of powerpoints you want to convert, Captivate is bad at this. It turns your slides into images.
Lectora is an excellent tool if you don't want software assessments. They have a new-ish screen recorder that I know nothing about. If you have some mad skills you might be able to manually create assessments. They include responsive design stuff and if you are converting powerpoints to something interactive, the import is easy and good. Love Lectora. Is very expensive.
Storyline/Articulate has a pretty good rep. I haven't used it but they have a great community. I use their community for ideas, even if I don't use their product. Rumor has it they are/can be responsive. Some of their stuff actually works with powerpoint, looks cool. I think they are less expensive than Lectora, more expensive than Captivate (though Captivate is getting pricier). Everything I've heard is they are really easy to use.
I've used other SCORM stuff, like iSpring(freeware) and eXe (now eXeLearning?--this was a long time ago, used to be in core...ish) and Camtasia. For SCORM, not especially impressed, but Camtasia has improved. Still not awesome, has some weird things, but functions. I'd only use Camtasia if you plan to do a lot of video based stuff and need reporting. If you don't need reporting, H5P does some really cool stuff with video and can interact with YouTube. If you use interactive video with YouTube, you lose the YouTube captioning, if that matters to you.
Addressing what Dan was talking about...yeah, SCORM is old. They've been saying SCORM was dying for as long as I've been using it...unlike flash, it seems to still be running around and functional. There are some upsides to SCORM, but also downsides. If you are not interested in documenting results, H5P is terrific. It has so many cool features. But reporting is not good. SCORM reporting is decent, unless your user has an unstable internet connection OR times out, then it gets frustrating. H5P can't really do software assessment; other than just video demo, it wouldn't be great for tutorials. I think about trying to do something like that for a minute or two, my brain starts bleeding, I stop. But it does have some super cool branching options and, other than poor reporting and no software assessment, definitely worth it, if you don't need reporting. Reporting is why I use SCORM.
Figure out what you really want/need. Choose your tool based on that. I'm keeping my eye on H5P because I really want to love it. They're talking about making the score interface better with Moodle...when that happens, I'll re-evaluate.