Hard to tell.

Yes, different lawyer may have different results. I think the greatest difference is if this lawyer is responsible or not. Meaning, your documents won't be messed up before they send it, send the wrong documents, or even delay sending out your petition.

These kind of things, unfortunately, you won't know it before you hire the lawyer. That's why you see people are asking for references for some lawyers.

If this kind of things happened to the appointed lawyer by your company, probablay you need to watch every step closely to make sure they are doing the right work.