I think that I've checked out Crystal Disk Info...wasn't impressed, but I already had Hard Disk Sentinel installed/paid for.
With software like this, I find it interesting to see the evolution of a given version...gives you an idea of previous shortfalls which may influence any decision to use that product. See http://crystalmark.info/software/CrystalDiskInfo/manual-en/History.html .
DiskCheckup is one that I had not tried...but it's a PassMark product, which I consider rates it as worth a look.
With many programs (not just hard drive utilieis)...it's a matter of user preference for interface, usefulness of data presented, how it's presented, etc. Example: I use 4 different programs to edit video after I have captured it via WinTV 7. I like some things that each does but there is no one program that allows me the flexibility that I have with the 4.
I don't take that approach with hard drive utilities, just pointing out that it's "user preference" that's the key factor for installing/using software, IMO.