There is no definitive answer to this question as it depends on a variety of factors, such as individual usage patterns and personal preferences. Some studies have suggested that Snapchat may be more likely to elicit romantic jealousy due to its focus on ephemeral content and its ability to facilitate more intimate communication between users. However, other studies have found no significant difference between Snapchat and Facebook in terms of their potential to elicit romantic jealousy. Ultimately, it is up to each individual to decide which social media platform they feel is more likely to cause jealousy in their relationship.