Which device to use to record my audio diary?

I am going to travel and am going to use Just Press Record to make an audio diary. Just curious of wich device would be more reliable; my iPad, iPhone or apple watch?

Forum: 

IPhone

the Ipad has a slightly better microphone than the Iphone in in my experience, and I'm assuming, though I haven't used one that the mic on the apple watch won't be as good as the Iphone. Of course, you get an external microphone then it doesn't matter. It depends on how mobile and unobtrusive you want to be. I've generally done travelling notes and the like on my iphone and anything more demanding on my Ipad Pro.

Apple watch

The apple watch microphone is awesome. I think I will stick to the phone for now though.