I say why reinvent the wheel. There are hundreds of pre-built themes/templates out there for creating a portfolio or CV with WordPress. If you want to showcase your skills you can always build your own theme or customize a free template to meet your needs.
On the other hand, if you are looking just to do something simple like a single page CV site with no blog or other capabilities, then building your own page may be an easier approach. However, if you have longer term goals and want to add to the site I would go with WordPress.