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Sorry of the above is like a riddle, but I cannot name any products or businesses at this moment in time.
If you can work the riddle out, I would love to hear your thoughts and opinion of it. Also i should add, the two products domains are just registered. The business domain is about four years old.
This is always a tricky one. By using one product domain name for both products, isn't that confusing?
Why not use two product subdomains for the two differing products? e.g. producta.example.com and productb.example.com
Oh, and yes, don't name the product or domains here.
Although, it will do absolutely no harm whatsoever to cross-link one to the other, unless they conflict in some way.
You're saying you already have blue-widgets.com, and you want opinions on whether it makes sense to sell green widgets from that site too?
I'd say it doesn't.
Either register green-widgets.com and sell the green ones there - linking between the two - or do something like:
Hope that's some help. Best wishes.
It also depends on what type of sale it is. If it is a one-time, lowest price wins commodity type sale, then you might be better off with the keyword domain. If it is a business brand name, repeat customer, loyalty type sale then probably the business name is better.
You can always create a small 1-5 page site on each of the keyword domains that points people back to your business name if want to use the keyword domain for SEO or PPC.