This looks very similar to Ark. Its always nice to have good options when looking for Adventure games, I have been looking for something like this, although I don't know if I will choose this one, I have been thinking about Witcher 3 since its an RPG hehe!
Cheers!
Overall I think Witcher 3 is a more rewarding experience. I can't imagine MHW being that much different 50 hours in than it is now about 20 in (though I may be pleasantly surprised). I love the concept of Ark but have unfortunately been deterred from it due to all the bad reviews. I may try it out nonetheless though.