Things that come to mind:
- having to leave personal data (and the quantity of data)
- likeliness of getting contacted by sales or marketing teams
- promise of trial: seeing the entire product vs only a part, flexible 'do your thing' vs strictly walled garden, etc.
- (no) credit card required
- start immediately vs wait for email to confirm your interest
- time to get started: see a ready-made instance of the product vs set it all up yourself
- others?
Curious to hear your thoughts!