As to the difference in colors between Sureria and Gold, is nothing to right home about. Yes, there are differences, but in metaphor it's like choosing between two different good friends to spend an afternoon with.
Another thing about C41 films, unlike traditional B&W, is that extra exposure actually reduces grain and avoids most color issues. I'll happily shoot 400 rated C41 films at EI's as low as 25 or even 12 in a pinch. At the underexposure end of the scale, I'm much more careful. 1-stop under is typically workable when needed.