Before I started using open reed calls I would have a few close reed calls inside my jacket and switch them out to keep them from freezing up.
I ran e-calls for a long time because of asthma, since I retired it seems my asthma has really backed off.. I use mouth calls more often now but need the right spots for them. I have a lot of faith in my e-calls and tend to rely on them when hunting with someone else.
E-calls are the easy button starting out, you never have to worry about if your putting out the correct sound.
They are both good tools