I think most data recovery pros use the following software each of which has it's specific strengths:
R-Studio (best all around, especially good for RAID)
GetDataBack (good for certain things, especially FAT filesystems)
Data Rescue 4 (best for Macs)
UFSExplorer (handles some odd file systems like XFS, decent for Macs, best for NAS recoveries)
along with some free software that has some powerful features:
ddrescue (cloning drives with a few bad sectors)
testdisk & photorec (surprisingly good at file carving / RAW recovery, good features for partition adjustment / search)