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I would pick the Slate over the Marble. I have Marble and it's hard to keep it clean if you have gas logs.
My comment is that if you use real stone of any kind, it is probably better to use smaller piecs, not larger than approx 18x18. The reason is that if you have a single slab of slate or granite or whatever, it will do a lot of thermal expansion and shrinkage, resulting in a crack in front of the fire eventually