I like the off-set sink in the first 2 because you get more uninterupted counterspace. If you want 40", try to find one with an off-set sink like the two 36" ones have. The more drawers the better.

I like the look of the last one the best. it looks modern and clean cut. I would go with the last one.

I like the idea of a larger vanity myself. More counter space the better and less things will be falling off the counter. Also if there is one with more functional drawers like #2, I think you will be happier. Allow you to hid things away and keep your sink area clean. Good luck!

post a picture of the bathroom.

just did my neighbors little bathroom. they had one of those older cultured marble vanities that extended over above the toilet. it was a right offset at 40" or so. we removed it and put in a 36" vanity w/a remnant quartz piece. doing a wall mount faucet gives you more counter space and easier to clean.

Here's the vanity,,,right off set sink. hardware is acrylic/metal

prob could have gone w/a 40" vanity and 1/2 inch overhang, but it would have been close to the toilet.

and lots of vanities here on Houzz.

More counter space is always desirable.