Evernote captures notes, pic, videos, handwriting, web clips & just about anything. Thus it's more complex and can be too much for those who are mainly interested in taking notes or creating reports that are synced and quickly accessible across devices. It's free.
Simplenote is a Stellar text based note taking App. Syncs just like Evernote, works across devices & platforms. It's fast & free.
I have reasons to use them both. They are my essentials.