Hi,
Vinyl tiles all the way. They look incredible nowadays, and come in a variety of price-ranges..
I have used both the high end tiles at $4.50 a square foot with extremely authentic grout lines and the 99 cent ones at Lowes. I daresay the cheaper ones actually pleased me better aethetically.
I've even installed the vinyl wood in bathrooms, and they look better and more authentic than the actual hardwood in the adjacent hall! It's my big-bang/little buck tip for a bathroom.

Easy to inslall and keep clean, super-affordable, and just gorgeous to look at and step on.. I wouldn't hesitate to recommend them to any home under about $300,000. They are just a pleasure to behold, and perfect for a bathroom.
~Michelle
Michelle Molinari
Certified Staging Professional, Feature This... Real Estate Staging,www.FeatureThisDotDotDot.com
CSP Elite Instructor, Certified Staging Professionals, www.CSPElite.com
Lead Virtual Designer, www.CurbAppealForDummies.com
President of Acadiana Real Estate Staging Association, www.AcadianaRESA.com