The decision to print a portfolio in color or black & white depends on the nature of your work. For designers and color-focused projects, color printing is recommended for its professional appearance and visual appeal. Conversely, if your work primarily features black & white designs or technical drawings, then black & white printing might be more suitable. Some commenters also suggest considering digital formats, such as PDF, instead of physical printing.
If the products of your work are in colour, then print in colour.
If, for example, you were a draftsperson who creates 2D drawings for a living, then black and white would be appropriate.
Andi ***********
It would not matter but colour gives a more professional look.
Artur *************
It depends on your work. If you are a designer, for example, in my opinion, using color is better. It makes things more visible, effective, easy on the eyes, and attractive.