PA does not have such a thing as "adjudication withheld" So I can't say what it mean. If it is a non adjudicative diversion all that will really matter in PA is whether you are convicted or not.
This information does not create an attorney /client relationship and should not be use or relied upon to make any decision in your case. Only consultation with your own attorney can provide you with the advice you need for your case.
If the crime that you were charged with occurred when you were a juvenile, it may be expungeable. It is suggested that you retain a criminal defense attorney to determine what actually is on your record and determine what if anything can be done.
You need to contact FL counsel and get your record sealed. The "withhold" allows this to happen. It will continue to be on your record though unless you get it sealed, which means it will pop up for potential employers. If you cannot afford an atty, contact the legal aid office in the city you were convicted in, they will do everything necessary for a small fee. Of course if you have been in trouble since the felony WH, you may have a difficult time getting your record sealed. First step though is to contact atty in Florida.