I'm going to install an Avanity Brooks 24" vanity in small bathroom. It s going to be a tight fit and will either have to abutt one wall (w/ the toilet on the other side of the vanity), or leave a 1/2-1 inch gap btwn the wall and top. This vanity is on high legs with 2 drawers beneath the sink (not a vessel), and a solid shelf below with open sides. I can get a custom top cut so I could have it made to go flush to the wall to avoid the gap. Question: Should I bring the top all the way to wall and add a sidesplash? Should I just caulk the joint and hope the paint or wallpaper hold up? OR leave a gap?

I'll def get a backsplash that matches the top. Leaning on a quartz over marble. Thinking a quartz sidesplash would be easier to cut if I want something slightly shaped. I really don't care for the look of a rectangular slab sidesplash on such a small vanity. I thought if I need one perhaps it can be contoured, sloped etc so its not rectangular.

Being so close to tthe wall and being an open unit I think I'll be able to clean around it but I may not be able to paint around it in the future. Thoughts? Thx!