NFT moves a shallow stream of nutrient solution through channels, while deeper-flow approaches maintain a greater depth of solution around the root zone. These differences affect water volume, root environment and response to interruptions.
The better choice depends on crop type, channel design, climate, power reliability and how closely the farm will be monitored.
Pump capacity, return flow, reservoir management and oxygen availability need to be considered with the growing channel rather than selected separately.
Ask for a complete hydraulic layout and operating method for the proposed farm scale before purchasing a hydroponic package.