You say: “Our value proposition is to create synergy while leveraging our respective ROIs.”
The interviewer thinks: “Huh?”
You don’t need to use jargon to sound knowledgeable in an interview. First, don’t assume the interviewer is familiar with the jargon.
Also, as many interviewers will tell you, people often use a lot of fancy jargon when they want to disguise the fact that they aren’t completely confident in what they’re saying.
So speak simply and coherently and your intelligence should speak for itself.