I agree with the above posts that there is no difference between the two so long as both provide a "snug" connection.
Also, no connector/bare wire is the best. However, be careful if you are using solid core cable, not to crush the cable in the binding post. And a single point of contact is desirable, especially on the hot.
Of course silver cable needs no tinning. With copper, sometimes yes and sometimes no. Depending on the composition (solid core don't tin) and your willingness to clean the wire you may not have to tin the wire which is better; there is no heat or change in composition to affect the character of the cable. Furthermore if you have to, I'm not so sure about using solder with silver in it (lead is worse) to tin the wire as the silver content may separate and/or color the sound of copper cables.