Since the majority of posters only have experience with one training department, they cannot make an educated comparison.

As others have said, ask about failure rates.

Some other questions I would suggest:
Is training in house or farmed out?
Do you feel check airmen are generally equally hard/easy?
During initial or transition, will the company give extra sim time to a "good" applicant that is having an issue or two?
Are the check airmen generally nice/helpful/angry/hostile?
Do you feel the training evolutions are well organized?