This is an excellent question to consider, because one of the aspects of this Gothic novel that is so interesting is the way that Shelley creates a series of relationships that feature the "double" or the "doppleganger." There are a number of characters who have profound links with each other, and certainly Victor and the creature he creates are one of these examples of doubles in the novel.
At first glance, Victor and his creation appear to have very little in common. Physically, they are poles apart, with the monster being very tall and strong and of a terrible physical appearance that repels those around him, making it impossible for him to establish relationships. Victor is of course a "normal" human with regards to his appearance, and as such is much weaker than the monster.
However, when we begin to think about it, there do appear to be a number of similarities between the two characters. Both characters are recluses, shunning or shunned by civilisation. Of course, Victor chooses to distance himself from his fellow man, leaving his father, Elizabeth and his family by themselves deliberately to pursue his scientific research. The monster does not choose to shun man but is shunned by them. Yet both experience alienation and isolation.
Secondly, both show themselves to be thinking, rational and intelligent creatures. Victor's scientific knowledge speaks for itself, but the monster, too, shows himself to be an extremely intelligent and thoughtful creation. Note his ruminations on some of the classics that he read whilst observing the De Laceys:
I can hardly describe to you the effect of these books. They produced in me an infinity of new images and feelings that sometimes raised me to ecstasy, but more frequently sunk me into the lowest dejection.
The way that the monster finds literary parallels between his situation and that of Satan in Milton's Paradise Lost, for example, shows his capacity to reflect and think creatively--just the kind of qualities that Victor has already shown in gaining the knowledge necessary to create life.