With Ack, I had to set up a bunch of --type-add lines to ~/.ackrc so that Ack wouldn't ignore e.g. SCSS files. ag searches every file by default, except for VCS files (e.g. .git/ and .hg) and files that are ignored by your VCS.
Ag's default behavior is way better, and less confusing to new users. Plus, it's faster.
Ag's default behavior is way better, and less confusing to new users. Plus, it's faster.