I travel with my portfolios on my iPad Mini with retina display. It will fit in my pocket if needed. If I need a larger image, I can whip out the dongle and use an HDMI display or projector.
My photos are processed in Photoshop then I down-size to 2400 px, import them into Photos and organize them there in multiple albums.
If size and weight were not an issue, I'd probably go with one of the larger iPad pros, however, the mini still does its job and beats having to take the time and expense of printing the work.
As always, YRMV and Blurb books are also a nice, though static, way to showcase one's work.