Making a good joint is about having a strong electrical and mechanical connection. I assume by merret you mean wire nuts, I personally wouldnt use them for anything... period. Also, they are best suited for solid core conductors vs stranded. Of course, time doesnt always allow to make a perfect connection since heatshrinking and soldering each and every connection is a very time consuming process which is why there are things like wire nuts and butt connectors and so on... which is fine. But if you want the best and strongest joint for something like joining speaker wire I still think the suggested method is the best.
