I propose to try the novel Reducing Atmosphere Drying method that can better preserve the freshness attributes of products than the freeze-drying.
For more information please refer to the following article.
https://www.researchgate.net/publication/333741319_Reducing_atmosphere_drying_as_a_novel_drying_technique_for_preserving_the_sensorial_and_nutritional_notes_of_foods
That all depends on the value of the product, the degree and nature of moisture content (water, and any other liquid), the nature of the product (how hard it is to dry, structure, sensitivity, density/volume etc.), the quantity of product you have and the time available.
"Best" is only determined in response to these (and other similar) questions. For example, raisins are OK air / sun dried and are very happy with the result. Strawberries, don't work this way and vaccines need a much more controlled process. Grass is naturally dried to create hay for storage, you would not freeze dry it due to the volume and process costs associated, albeit a consortia of horse owners in the Middle East did consider a project to freeze dry grass in Uruaguay throught the year and air-freight it to their valuable horses, but even they couldn't afford that!
A RW dryer can produce high-quality products with retaining heat sensitive vitamins, color, phytochemicals content and antioxidant activity close to the freeze-dried products, while the cost of the RW equipment is less than 30 percent of the cost of a freeze-dryer and the energy consumption of RW is less than 50 ...http://ologyjournals.com/jnfrt/jnfrt_00011.php
The energy efficiency of the RW dryer is 3-fold and 40-fold higher compared to the spray dryer and the freeze dryer, respectively. The content of carotenoids and capsaicinoids decreases significantly by freeze drying and oven drying as well as RW drying. https://www.sciencedirect.com/science/article/abs/pii/S0924224417303886
To dry a similar amount of product, the cost of the RW equipment is about one-third of the cost of a freeze-dryer (FD); while ...https://ukdiss.com/examples/quality-preservation-refractance-window-drying.php
The RW drying systems are simple and relatively inexpensive when compared with freeze drying, which usually needs large installations to ...http://sites.bsyse.wsu.edu/tang/main/publications/pdfdocs/articles-published/tang133a.pdf
Reducing Atmosphere Drying method protects antioxidants, pigments, vitamins, flavonoids, carotenoids etc better than freeze-drying.
https://link.springer.com/article/10.1007/s13197-019-03850-2
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