When comparing Asunder vs ripperX, the Slant community recommends ripperX for most people. In the question“What are the best CD rippers for Linux?” ripperX is ranked 1st while Asunder is ranked 2nd.
Ranked in these QuestionsQuestion Ranking
Pro Easy to install
Can be found in the official repositories for most distributions.
Pro Allows specifying encoder options
Small memory footprint.
Pro Very stable
Works great for creating a lossless audiophile collection of owned CDs.
Pro Allows ripping in multiple formats at once
Pro Very easy to use
Supports Gnudb (including the proxy setting). Supports many output formats, with a simple interface.
Pro Simple to configure and execute
Pro Encodes CDs
Pro Configure interface allows easy tuning of output quality
Enables access to some of the more advanced features like scratch repair or FLAC compression level.
Pro Can easily be patched to work with www.gnudb.org (after freedb having gone offline)
Recompile ripperx v2.80 with patch from here.
Con Does not support MusicBrainz for tagging
Con Segmentation error
Ubuntu 18.04 - start from command line: "Segmentation fault (core dumped)". From GUI it does not start at all. Let's google a bit..
Con Lacks a path example to see as you select (like easytag)
Con No choice of file type
This is only for Ubuntu.
Con No alternative to freedb
With freedb going offline, there's no clear way to get cddb info.