[MRSPORTSCARDCOLLECTOR]

Hi,there.
I don`t know much about modern rookie cards.
I am just wondering what the best Mookie Betts,Xander Bogaerts and Jackie Bradley Jr rookie cards are?
My 9 year old son and I are big Red Sox fans.
I was looking to surprise my son with his birthday and Christmas coming up with the rookie cards.
I am looking for them for which ones would be the best ones to get for him that might have a chance to go up in value.
I know the common rookie cards are not valuable,and I guess I would be interested in the refactors for him?
You know something I could get certified and hold on to for him.
Thanks in advance. I am clueless about modern cards,but would like to learn.