Is honed or polished marble better with hard water

Nothing about a new marble slab looks wrong on install day, and that is exactly where polished and honed finishes part ways. The running record marble countertops riverside eggart guild holds shows the same pattern on kitchen countertops across Riverside, CA: the finish decides which problem arrives first, and it is rarely the one the owner expected.
What the two finishes are

A polished finish is ground and then buffed to a high gloss. A honed finish stops earlier, at a smooth matte surface with no mirror shine. Same stone, same slab, different last step on the line. The gloss on polished marble reflects light, which makes every flaw read sharper. The matte face on honed marble scatters light and hides a lot of it.
Etching is chemistry, not dirt

Etching is a reaction between acid and the calcium carbonate in marble. It eats a dull patch into the surface. Polish does not prevent it. The dull spot just shows far more against a glossy face than against honed, where the surface is already flat in tone. Lemon, wine and tomato all do it, and so do some bathroom cleaners.
Hard water rings
Hard water leaves mineral deposits, and they show as white rings on dark or polished stone. Around Riverside the water is hard enough that a wet glass or a dripping faucet leaves a mark within a day. Wiping the faucet area dry after use is the simplest way to limit buildup. Granite and quartz show the same rings, but marble adds a second problem when the wrong cleaner is used.
The cleaner matters
Removing hard water spots with vinegar or other acidic cleaners will etch marble. A pH neutral stone cleaner is the right choice. The ring comes off with patience and a soft cloth, and the stone keeps its surface. Vinegar trades a white ring for a dull one, and the dull one is harder to fix.
Sealing and staining
Honed marble can be slightly more prone to staining because its open surface absorbs liquids a little faster. Sealing matters on both finishes, but a honed slab gives less margin. Oil, coffee and red wine sit in the pores if they are left. A sealer buys wipe-up time, not immunity, so spills still get cleaned the same hour.
Grit, scratches and refinishing
Fine grit carried in by santa ana winds settles on every surface in the inland empire. Dragged under a pot or a rag, it leaves light scratches on polished marble, and they catch the light from the window. Honed hides them better. Either finish can be refinished later by a stone professional using abrasives and polishing compounds, so neither choice is permanent. Pick the one whose weak point the household can live with.