This question primarily depends on personal taste, and specific channels might sound better on different instruments.
The point of using different channels is more about their collective effect. In other words, it's not as essential to use the same channel on any given instrument but more about making sure all the channel numbers are unique. That way, all your tracks will combine in a way that is more pleasing to the ears in the same fashion that tracks are combined on analog desks when their signal flows through the slightly different components of each console channel.