Quick response
1) depends on the added functionality, the material used etc.
2) it should be unambiguous if someone is part of your customer group or not.
makes your marketing much easier focussed and cheaper
check the P's of marketing - People, Product, Place, Price, Promotion, ..
3) If all the same I stick to a well known brand, the newcomer has to be disruptive
==> read the innovators dilemma / Clayton
4) something else, it can be the location, someone you know that bought there, someone that works there, free goodies
trust is something that will be build during a relation - or a common trust in a middleman