Sometimes (if you own a newer Plextor RW drive and encounter Read/Sync errors with EAC) Plextools are still able to retrieve a perfect rips at the expense of having an interface that isn't quite comfortable (to say the least) as EAC's and does not allow any given CLI encoder to be used.
My Plex Premium (in conjunction with Plextools Pro) can sometimes recover badly damaged discs (still erraneous with remaining CU errors being reported, but without audible problems) where EAC fails with audible clicks/mutes in secure mode. This doesn't have to be the case - from my experience, it can be the other way round as well.
Obviously it doesn't hurt to install both EAC and Plextools ... both do an excellent job at DAE although I prefer EAC due to it's higher flexibility and cuesheet ripping (Plextools can be only set to ripping a single file on multiple selection).
My main task for Plextools (Pro version available with Premium and PX708A only) is the C1/C2/Jitter disc scan for recorded/pressed media and the TE/FE disc scan of blank media, though ... I always like to be informed about certain aspects of quality