They were both based on the same book, Richard Matheson's classic novel "I Am Legend".
Price played the main character with an exhausted, resigned, quiet desperation while Chick went at it with his usual scenery-gnawing, street-strafing, messianic vigilante zeal.
Cheston *is* the king of 'Doomsday flicks', God bless 'im....:)
Chick, of course, should've been Chuck.
[whose stupid idea was it to put the i and the u right beside each other?!?]....:D