Do you mean he wants to grow them as an ornamental plant to look pretty? Or is thinking of growing them small scale commercial? If Its the first, I always thought Mt Hoods look the prettiest...I don't know why. Maybe the way they grow thicker clusters of cones. Magnum's are also kind of nice looking.
If its the second, tell him to plant at least 3 or 4 different varieties to see what grows best in his soil. Cascade is a staple to most craft brewers, so that's one that is easy to sell. Stick with the big C's. Or tell him to buy 6 packs from local brewers and read the label to see what they typically use. Grow those varieties.