I think a maker's mark needs to be personal, yet having something that is eye catching to make the customer want to check out your webiste or walk into you shop. I have 2 different types. The first one was the Maker stamp I started out with. Showing off the hand drawn Green man image with is out main image logo on our cards and and site, We had made into a Magnesium stamp. We simply put it through the Lucris press and make the impression. Younger folks like this maker stamp.
My other is certainly more professsional . thre different sizes, 1 inch, 1.25, and 1.5 wide all are 3/4 high. We stamp it on our higher end items. I had a friend who did our website make up the designs then she sent them off to be made.
I also use a GML stamp for my Jack Sap Straps. We put our logo on ever product that leaves our work tables. It proudly states what business made it and encourages people to look you up and to possibly have a referral just from them seein the logo!
That is my loonies worth.