I tried sound-juicer, ripperx, Grip, Asunder and fre:ac.
Though it had a nice GUI, sound-juicer had no settings at all. ripperx was somewhat similar, but lacked the nice GUI. Grip also had not many options, but produced a good output MP3. Sadly, Grip is discontinued, so it doesn't make my list either.
The last two "competitors" are fre:ac and Asunder.They both have many options and produce nearly similar output (almost identical files in both size and quality). Fre:ac is clearly modeled after the famous EAC for Windows, but in my opinion it also inherited the bad GUI. That is not necessarily bad, but I discarded fre:ac for my needs.
I'd recommend Asunder, because it has not only many options for the encoders, but it is also simple to use, fast and looks minimalistic and nice. No unneeded features, good output. Download it!
though sound-juicer seems polished, I had more luck with asunder.
A family member is a new ubuntu (14.04) user and got stuck on profile options within sound-juicer (using mp3 instead of ogg). Though the necessary lame/gstreamer plugins were present, sj complained about profile settings but didn't offer access to the settings window. some other window that could only exit blocked it. presumably she fell through some hole in gui logic. asunder came to help.take it with a grain of salt, this helping was over a telephone. I have to reproduce the issue and need to file a bug with sj if this verifies.
All the others seem to do a lot of fancy things, but I just wanted something that did a freedb lookup, ripped to MP3, and stuck in a sensible folder hierarchy. Which asunder seems to do :)
Our users have written 3 comments and reviews about Asunder, and it has gotten 28 likes