Onn 4k Pro vs...

Fire TV Cube 3rd Gen. Coworker wants to sell me his Cube for $50. Hasnt used it in months so shouldnt have the latest update that blocks launchers. For general use/streaming is there much of a difference between the two? I already have the Onn 4k Pro with Projectivy installed and am quite happy with it. But for $50 ill glady try the Cube if it is a perceptible difference. Thanks