My preferences...
I prefer NOT to use bare wire, just because the contact area can be fraught with issues like micro arching, oxidation low area of contact i.e. depending on the wire used
I do prefer Bananas, but these too can have problems
- the area of the connection on most bananas is very small due to additional clips that provide grip
- Locking bananas actually have a very low area of conductivity with multiple points of contact
- Spring clip style of bananas are NOT perfectly round, so their contact are is again quite small
- the metal the bananas are made from is often brass or some copper alloy, which has a lower conductivity than copper
Spades my be a requirement due to heavy cables, but their area of contact is only marginally better than most bananas, but there are several companies that offer solid copper spades or silver plated spades vs. the brass versions which are not the best choice
My preference of Banana:
KLE Innovations banana plugs - because they are
- very well designed
- silver plated - which I prefer
- the only banana that is perfectly round and fit the binding post PERFECTLY
- the
- the best sounding connector I have tried
- their contact area is almost 1 square cm
The only drawback is they can work loose and only accept up to 10 gauge cables, so they may NOT be for everyone
Furez is another company that makes a very good fitting banana in plain copper or Silver plated copper
My preference of Spade:
- Furez - because they are very well designed/manufactured
- caters to different gauge wires
- offers different connection methods, screw, crimp, solder
- options of Silver plated or plain copper
BUT - this is just another opinion - FWIW :-)
Enjoy - Steve