I use both, and wordfence is great at checking ‘known’ files against the repository, but does nothing with UNKNOWN files. I had a hacked WP that Wordfence could not find. Using the https://github.com/philipjohn/exploit-scanner-hashes/ project allowed me to generate the hashes for WP and then run a scan against ALL files. It found 20+ files with malware in them that Wordfence just missed because they were not officially part of a plugin. They were found in the upload directory as well.
So you really need both tools and exploit-scanner does not really need more than the hashes to be updated for it to work, plus one other item to make it work with W3TC and other object cache tools (it does work as expected with Tribe Object Cache however).
So I do not feel it is abandoned, plus there was a recent update. I use it, and use it effectively.