The lighter-background tee shirt is much more in keeping with the feeling of the white jeans. Unless you’re decidedly top-heavy, in which case you might be more comfortable in the 2nd ensemble.
Frankly, I think either of these outfits works well, but the one on the left does give you a more unbroken strong vertical line.
With a lighter skirt, the cream top seems to flow better, although again, I don’t think the 2nd outfit is really terrible – I could easily and happily wear either…
But here is a case where a dark tee shirt is a difficult choice. The white just seems to work better, both from a “mood” standpoint, and a flattery perspective. If you felt that you really did NOT want to wear a white shirt here, maybe the striped top just above, or a top toned to the cardigan, would be a better choice than this very dead black.