It is durable (hence it's use in restaurant kitchens) it shows every mark, splash and splatter. It is easy to clean and you will get lot's of practise!

If you clean your stove after use, taking a few seconds to wipe down the backsplash is no problem. You can get textured (scratched) distressed stainless which won't show as much dirt. Because it's nonporous, a texture won't effect the cleanliness of the area.

We are an online supplier of stainless steel mosaic tiles for backsplash and metal applications (aluminum, copper). We notably carry subway and textured stainless steel tiles. If you have a chance, check us out at:

http://www.houzz.com/photos/products/Buy-on-Houzz/seller--edenmosaictile

You could also browse our customer installations for more stainless steel and other metal backsplash ideas:

http://www.houzz.com/projects/72838/eden-mosaic-tile-installations

From your description, it seems both styles should work for your project. Also stainless steel tiles are considered low maintenance. Just (warm) water and soap to clean the tiles with a dry wipe at the end should be sufficient when cleaned regularly.

Either the sheet or the tiles will need the same upkeep (we have tiles). You have to clean any type of backsplash, but stainless just requires ensuring there are also no streaks after being wiped.