Which BP vault or Draws?

I’ve got come CP and I want to spend some before the Rebate ends. Should I buy a BP vault or should I try a draw? I’ve got some 666cp now. I don’t have any preferences on the BP vaults in offer. I just like character skins more than gun skins though unless the gun skin is legendary. Can you guys let me know what I should do or which BP vault I should buy? Thanks in advance.