Help I can‘t decide, Evolution or Bike?

Should i “waste“ another 12 pulls to evolve my 5star outfit or should i safe the diamonds to pull on the bike banner? I‘m f2p so i need to be pickyy

Should i “waste“ another 12 pulls to evolve my 5star outfit or should i safe the diamonds to pull on the bike banner? I‘m f2p so i need to be pickyy