Porcelain and ceramic tile
The default for good reason: fully waterproof as a surface, hard-wearing, and available in slip-rated finishes. It needs a rigid, deflection-free subfloor, which on timber usually means overboarding with a tile backer or ply. It is cold underfoot unless you accept that, and it is unforgiving of a dropped glass.
Sheet vinyl
Underrated. A single welded sheet with coved edges is the most genuinely water-tight floor available, which is why it is standard in commercial washrooms and accessible bathrooms. Modern designs are far better than their reputation, it is warm underfoot, and it is the cheapest sound option. It can be dented by heavy fixtures and cut by grit.
Luxury vinyl tile
LVT gives the look of stone or timber planks with vinyl's warmth. The critical detail is the joints: click-fit LVT is not suitable for a shower area or a wet room, while fully bonded LVT on a properly prepared floor performs well. Ask which one is being quoted, because the price and the risk differ.
Engineered timber and laminate
Engineered timber can work in a cloakroom or a bathroom with a bath only, provided splashes are wiped and the perimeter is sealed. Laminate should be avoided; its core swells irreversibly once water reaches an edge. Neither belongs in a wet room or a level-access shower area.