I have a very simple form to get users signed up. My MD (not the brand stakeholder) wants to use social sign-in as he thinks it's easier. I feel that because this is a small form, users are more inclined to complete it rather than being suspicious of handing over social access. He wants to add large social buttons top of the field (fb, G+ and Tw) but my argument is that due to this being mobile, it's going to push the form down and hide the Create Account button.
Has anyone had any experience as to what is more effective? My demographic is international 20-30 year olds.
PS prior to this form, the user has played some games and has won a prize, to claim the prize they must create an account.
Thanks in advance