the bottom oxfords for sure. i love the cap toed white boots too. they look like the chanels. but if i HAD to choose one it'd be the two-tone oxfords.
i would pair it with a black pencil skirt, possibly high waisted, and cute white blouse. or a dress along the lines of this:
I like them both, but you would definately get more use out of the second pair.
I'd put them with black or gray cigarette pants and maybe a batwing top with a low back, for an alternative semi-evening look. Or for something more everyday, a bright, solid button-down with short, puffed sleeves.
I think the laced black and white pair look hot - although the look may be seasonal so the black lace-ups might get some use in later seasons. I think these type of boots look great with skinnies or with a well fitted high-waist skirt!