Just watched both gameplay trailers for Breath of The Wild and Mass Effect Andromeda and I don’t know which game I’m more excited for. BoTW looks like it will be the more innovative of the two as Andromeda seems to have adopted a few more modern game play mechanics from other games than BoTW. The most obvious being the Arkham Detective Mode. Andromeda however is most likely going to have a much better plot and characters as Zelda has always never had masterful storytelling or interesting and layered characters. I very much doubt Nintendo will ever change their method of story telling or how they develop characters.
Gun to my head I’d say Andromeda but I’ll probably end up enjoying Breath of The Wild more as it looks more fun and innovative.