I'd probably go with acrylic since it's durable, easy to keep clean, and holds up well in a damp bathroom.

I'd also pay attention to what the cabinet is made from, as that's just as important.

I purchased a vanity from Royale Stones because it was built with marine-grade plywood instead of MDF, and that gave me a lot more confidence it'd last over time.

Soul Black Marquina Marble Top & Solid Wood Freestanding Vanity - 900mm · More Info

Why not get a glass protector top, you can also get anti-scratch options. Clear, waterproof and easy to clean....