Off subject - GPG for Android

Gpg4win help-en
1

I’m looking for a trustworthy and user-friendly encryption product to use on my Android smart phone. I found four implementations of GPG. I don’t know anything about the competence or trustworthiness of the implementers. Can anyone help? I found:

APG - Thialfihar
Gnu Privacy Guard -The Guardian Project
OpenKeychain - Dominik Schürmann
PGP SMS lite - woodkick

2

This question is best asked on the gnupg-users list.