Your wife will need to do some research but this is my personal opinion--traditional Medicare with a supplement and a Part D prescription plan is the best way for most people to go. Since you live in Florida you need to get a supplement that you can stick with for life if necessary, you might not be able to change in the future if you develop any health issues. I got the AARP United Health Care Plan G supplement, it was the best deal for me and this plan has not had big price jumps in the past. There are some supplement companies that "close the books" so they can increase their premiums substantially--Mutual of Omaha did this to my husband and he is stuck with them because he has health problems and now he pays big premiums. AARP United Health Care has never done this "close the books" trick.
For the Part D prescription plans, the rules are different--you can change every year no matter your health. Your wife should go to Medicare.gov after 10/15 to look at the Part D plans. They have a Part D finder where you put in your prescriptions, preferred pharmacy, etc and it gives you a list of Part D plans in for area the cost. I look at this every year and just choose the cheapest plan.
Good luck. There are a lot of Medicare threads on this Forum.