Both are professional only install products. They both must be approved by Carpro, with Finest Reserve being the hardest to get approval for. The Professional is guaranteed for 2 years, and FR 3 years. It has to do with chemical composition, thickness, properties and water angle, etc. It's actually quite complex, and if you didn't know it was for real, it would sound like it was made up, lol. FR does require being cured with IR lamps.
You can be sure if your detailer is authorized for Pro, they are good with quality results. If they are auth for FR, they are the absolute best. Apparently 99 out of 100 who apply to be able to use Pro are rejected. That makes them 1%ers so to speak. The number who are approved for FR would then be the 1%ers of that 1%. I only mention this because you can be assured of the quality of work before you agree. My detailer, who started this thread, is one of the FR installers, the best of the best.
As far as picking between the two, it will likely come down to cost and expectations. I'll bet you will be thrilled with Professional, but the paint correction before FR might exceed that.
Cost is hard, it depends a lot on how much paint correction is needed. My 4 month old car required a 2 stage correction, and my detailer spent approx. 25 hours on the correction alone. Once corrected, the coating itself is likely similarly priced for most applications, depending on size and complexity.
If your detailer installs both, have a discussion with them on what they suggest. Since they are quality installers, they most likely won't just push you towards the more expensive options, but will likely tell you the differences in expectations, etc.
Where I live is very expensive, my detailer at the time charged $75 an hour for the correction. My cost for the correction and coating of the paint alone would have been $1,650. I also had the wheels and calipers done, and Dlux on all plastics which added to the cost. Expect to pay something similar depending on location and paint correction hourly costs.
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