507 or 637 bus to KEGS?

[Bikkigirl]

I have DS starting year 7 at Kegs in September and just wondered if anyone out there had any views about which service might be preferable in terms of reliability or any bother on the buses, one goes just to the Chelmsford grammars the other one drops off at 2 other schools as well. Just wanted any info to help us pick which one will be best for him as starting secondary is daunting enough as it is!