Hiring a criminal defense attorney is an important decision. Perhaps hiring an attorney with prosecution experience will result in more effective representation and allow you to benefit from the attorney's experience on the other side of the aisle.
How many years were you a prosecutor for?
More experience is almost always the better option.
How many cases have you tried?
Again, an attorney who has tried a lot of cases will be known in his community as a 'trial' attorney. This reputation will not escape prosecutors, who may be willing to take plea bargaining more seriously because of it.
How many open cases do you have?
Knowing how busy an attorney is will help you gauge how much time they have for your case with respect to your expectations. If you demand extra attention, a busy attorney may not be the right fit for you, and you may want to select a boutique firm that handles fewer cases.
Have you ever been disciplined by the Bar?
Even the best attorneys get bar complaints. But the best ones will also be absolutely candid, too. Trust is the essential foundation for effective representation.