New player with a question

Hello, i started playing warframe yesterday and I’ve been really enjoying it. At first i started with what id assume is the base game story where someone puts a flower down and resurrects you. I spent about 4 hours upgrading that character, then saw the thing on the map that said “enter duviri”. There, I started playing and I thought they were going for like a different gameplay, more dark souls esq, but then I unlocked playing a warframe. It seems like the progresses are separate, so I was just wondering, will they ever merge? Or if not, which one should I do first as a new player? They both interest me but I do prefer playing just the warframe for the most part.