I have spent just over two years developing my vertical macro rig for coins. I started with a modified enlarger stand, migrated to a Kaiser copy stand I have learnt a number of things:
1: Copy stands are good for what they were designed for, which is photographing documents. For coins they can be little better than a stabilized tripod particularly those that cost less than US$100.00 new.
2: To get the best pictures you need to spend some money on a good support. But do so with thought: a heavy drill press( I recall seeing pictures of drill press rigs in this forum) would be better than both the options pictured in this thread.
You need a support system that doesn't move, "locks" the camera and Subject together...so they vibrate the same. An enlarger stand or copy stand with a counterweight and geared rack( as opposed to friction drive) are in my opinion the key features you should look for.