The biggest difference as far as candlemaking goes is that a very low melt point wax will NOT work for a pillar candle as it will fall apart when you burn it. You _can_ use a high melt point wax for a container candle, but you probably won't get as good a burn OR as good a scent throw as you would with a lower melt point wax. A rule of thumb which doesn't always work totally perfectly, would be that the higher the meltpoint, the harder the wax, but that's a generalization.