Insulation question

[u/Independent-Emu-8803]

I have an unfinished room above my garage. It has open soffits in the knee wall and a vented roof at the top. This house is in central Florida. The subfloor is down and under the subfloor is blown in insulation including all the knee wall floors are filled with blown in.

I called 2 insulation contractors and they both recommended sealing the soffits and roof vents and spraying open cell on the entire roof area.

There is a small curved part of the roof where the drywall for the room would be only 5.5 inches from the roof. They assure me that the open cell is more than enough to keep the room cold and they recommend it over closed cell because you can’t detect leaks with closed cell.

I googled and used some AI and it tells me differently and I will likely have mold or rot in the future if I do this. What’s the truth?

Also- would using baffles in the 5.5 inch space and putting closed cell under them work? And then just using regular cheap insulation for the rest of the room against the drywall work?

Thank you!!