Newly diagnosed...

My wife has had a hand tremor for almost two years now; also her handwriting is getting smaller and she has shoulder pain and mobility issues; we saw three different movement disorder specialists and two felt she had Parkinson's and the third said we should wait to see what develops but now she also feels it's PD. She has been on meds for Essential Tremor which have helped somewhat, but now we are going to start with PD meds and I am curious what would be the best meds to start with? An agonist, Levodopa-Carbidopa, or some other med? I am curious to know what other's experience has been with medications.