So you cut the slice diagonally, so that you have 2 triangels per slice?

Squares (if it's a ham+cheese Sandwich I don't need to cut it)

Bloodborne monster shaped FTW:

I don't usually cut sandwiches, so rectangles I guess

I do like the look of triangle slices more than rectangle slices though

You forgot a very important distinction for rectangle cutters.

Do you cut length wise or breath wise?

Do you prefer to end up with a rectangle and a butt shaped piece, or 2 symetrical pieces?

I cut lengthwise if the corners are too fiddly for a triangle cut, triangle cut mostly.

I prefer triangles, but i can never be bothered to do the 2nd cut. If it's got more than a slice of cheese inside then i know it'll disintegrate into its base elements, and i'll have to spend the next 2 years creating a time machine to stop my former self from travelling down this dark path.

So i guess rectangles are fine.

I don't cut my sandwiches. 

I don't cut my sandwiches. They just get picked up and eaten.

I suppose we aren't kids anymore.