I somehow feel that bare-wire sealed with insulation tape at binding posts transfers the most current to and from the amplifier to speakers. what are the positives and negatives of such connections?
The connectors you use are entirely down to personal preference. The bearing they have on sound quality is negligible. You could argue that bare wires are the best because they place the least amount of electrical transfers between the wire and the terminal, but I prefer banana plugs because they are convenient for unpugging wires. I know some like spade connectors because they have a larger electrical contact area and are quite secure.
Banana plugs or spades make it much easier when it comes to changing kit, they can also protect the cable ends from corrosion. The best thing of all is that you won't ***** your fingures on the bare copper strands. Plus when you reach your senior years, it will be easier to see what you are doing!