Mongoose Traveller is very similar to Classic Traveller.
So far I like what I am seeing in Hero but I am questioning if playing normals would feel a bit limited in this system. BRP is a great system for mundane to heroic characters but gets strained for things like demi-mortals, (supers). In reading Hero it definitely seems fine tuned to larger than life. Mainly because of its graduations in characteristics being 5 points for a +1 and skills being heavily linked to these stats. Once I get through the book I'm going to create some average adventurers and run then through a small dungeon crawl, heist, assassination mission, etc. If it plays well then Hero might be all I would need for anything. If I was playing supers then Hero would definitely be it but right now for space its Traveller, Sword and Sorcery a Runequest 3rd ed derivative. ⁰