I am new to woodworking and trying to build a small (2’x4′) split top Roubo workbench. I currently have 4 pieces of 2×12 (Douglas Fir) that I would like to laminate to get 2 pieces of 4×12. They would end up making the top of the workbench. My question: is there a structural difference between gluing two 2×12 flat on top of each other, or cutting them down into 2×4 and gluing them sideways? It seems that most people do the latter on the internet, so I am curious to know if there is a reason.
Thank you for your time and advice!