I'm very hppy with PI. Having said that, AF and PI were very similar last time I compared them, and appeared to be happy to copy one another's features. They seemed to be leap-frogging one another, so it will be worth seeing who is ahead right now.
In particular, PI gives a good view of agenda + due tasks on a single screen (dated tasks - heresy!! but I get to tick them off, which feels great! Actually, you just need to understand that a dated task is a hard entry in the diary and it's OK)
What do you use notes for? I use voice notes for data capture, but process everything onto a task/diary entry or a Listpro list.