We have limited knowledge of either guy so this is all gonna be pure opinions.
Orji
Denard Robinson. I don't think Orji is as dynamic a runner, but the times he has run, I see the talent and strength. Maybe a bigger, not as shifty, stronger, but less proven as an all around QB than Denard.
Davis Warren
A more athletic, but shorter Speight. A more, athletic, taller, and more fluid athlete than Cade McNamara.
Maybe Griese too.
Orji
Denard Robinson. I don't think Orji is as dynamic a runner, but the times he has run, I see the talent and strength. Maybe a bigger, not as shifty, stronger, but less proven as an all around QB than Denard.
Davis Warren
A more athletic, but shorter Speight. A more, athletic, taller, and more fluid athlete than Cade McNamara.
Maybe Griese too.