Would say the derelight is way bigger, in the comics there is a cute out and can clearly see the eggroom onboard and the pilot room and the extra spaces where the newts parents walked through in sea of sorrow, finding dead xenos and queen alien even onboard and the navigator chair which is elsewhere onboard.
In the alien movie in a shot where one see the 3 crew members walking towards it: they are super tiny compared to the derelight. The shot where one see 3 tiny small lights walking, almost too tiny to be seen while the ship takes most of the screen. MAde the juggernaut to look small in comparison in prometheus.
