[SixClub] Question on RG8 or RG213

[larry fields,n6hpx/du1 manila]

   Have a short question here and hope to get a good
answer. I have been thinking of buying more RG8 coax
for my 6 meter dipole to raise it up higher. But was
talking to a radio store an was told that RG-213 was
better than the RG-8. Is this true or maybe.
    
   Thanks, Larry Fields, n6hpx/du1