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You had to think very carefully to answer this question. Amy from St Albans Primary School, Kevin from CIS, Hong Kong, Kirsty who goes to Steeple Morden and Ruth all reasoned it through very clearly. Here is Amy's argument:
When Jill did it, she picked out $7, 8, 6$ and $3$. To make the biggest even number she got $8736$. Vincent picked out $4, 2, 9$ and $1$. The biggest even number is $9412$. Vincent won because he had the highest even number. I worked this out because $9000$ is bigger than $8000$.Thank you for a very clear solution, Amy.