For concept design, I think the simple stair takes a lot of beating. It's easy…
Vectorworks Tip 430 – Creating a Left Stair With the Simple Stair Tool
Unlike other stair tools, the simple stair has all of its options on the Object Info palette. This makes it extremely quick to make the changes to the stair. In order to create a left stair, you can choose this option from the Object Info palette.