You should marry the spouse who is most religiously compatible with you.
Not wearing hijab openly is an act of fisq and is a sin. One must remember that such a woman will raise their future kids if Allah blesses them. If a young girl was to see her mother not wearing hijab or dressed in ways which are not proper, she may imitate this.
The same applies for a woman in choosing a man. Does she want a man who doesn't pray and who may do sins in front of her kids?
May Allah grant you success