color of seam sealer?does it matter?

just wondering if anyone can help me out. does it matter which color of seam sealer I choose? does it make any difference?
was thinking of buying 3M™ Urethane Seam Sealer for my car but it comes in grey, white, black, beige. I was thinking grey just coz it matches the primer.

and what is the difference in these 2 kinds?

http://3mcollision.com/3m-urethane-seam-sealer-grey-310ml-cartridge-08362.html

http://3mcollision.com/3m-urethane-seam-sealer-08360-white.html

thanks for anyones help :)