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That's what I was thinking as well@yourdomain.com seems more professional and less likely to be spam.
Which do you think would be more effective?
A custom domain will always be more effective.
I'm not sure if custom-domain aliases still work for Google Apps, I've moved to Office 365 which they don't allow cross-domain aliases anymore and require additional subscriptions to do so. But my workaround is simple.
Even if you are managing multiple domain names and you're reaching out for one of those domains, you can use a @parentdomain.com and say this is the establishment that manages this domain, among others.
Boom, you've raised the bar.