The portability of a handheld device is probably the greatest advantage they have over other platforms. If you're someone who's on the go often and want to bring a device with you other than your phone, a handheld is perfect. Though when it came to handheld devices back in the day, they were always weaker in terms of specs. It was always cool to see what devs could do to push the hardware and create unique games for platforms like the GBC compared to their console releases.