I am a fabricator. Just a watch out for marble backsplash; not too long ago we replaced a customers marble backsplash behind a stove because it had become stained from smoke and grease from cooking. It had only been there about 18 months.

Just be careful on getting quartz that is very low contrast. . .we put in pure white quartz countertops at our beach house. Definitely won't be doing that in my regular house - the white countertops show EVERYTHING!! Every crumb, every streak from wiping down the counters. They look great for about 30 seconds after cleaning them, and then life happens and they're a mess again.

I think it's best to focus on getting a quartz that is either very solid and/or in a contrasting color to your marble (a distinct shape like herringbone also helps). If they are too close in pattern, the faux finish will stick out, imho.

Regarding the backsplash behind the stove -- some people have had problems, especially those that fry a lot. I've been diligent with sealing and wiping up after use. (As aside, we have pure white quartz in one kitchen and gloss black granite in another -- both show crumbs and smears, for different reasons. The grey quartz shows the least).

You need to get samples of each and put them next to each other....you will then be able to tell if YOU are going to like it or not.... doesn't really matter what we think!