Hello Carol,
I have flown Jet Blue from Miami once and Fort Lauderdale twice and I prefer Fort Lauderdale. I like the Fort Lauderdale airport better as Miami is always very crowded. At the Miami airport I also found when I used Uber to return back to the place I was staying (son in law) the Uber drivers drove off the airport property to drive the rates up 300 percent, so I waited until they decided to start driving back to the airport again but still paid more than normal.
Now I just drive down I-95 from New Smyrna Beach early in the morning to Fort Lauderdale and use 'off airport parking' and they shuttle me there and back.
I vote Fort Lauderdale airport.

Jim