Dear CH,
Actually colour backgrounds r generally uses for websites, brochures etc. White background versions r more suitable for stationery, t-shirts etc.
It's better to ask winning designer all kind of backgrounds or non background versions and after u've selected your logo. Designer has to provide all u need.
I mean, with background or not it's the same logo:)
Btw, I'm working on for the revisions right now and i'll submit them asap.
Regards,