While the 2 products have the same NCS (Nitrogen Control System) valve and will give you the same level of control, the level of infusion will vary slightly between the two products. The Nitro Infuser Pro will provide a slightly stronger infusion which can result in both a longer cascade effect and a larger head.
The Nitro Infuser Pro is designed for robust commercial applications such as bars, restaurants, tap rooms, cafes, coffee shops and event centers whereas the Nitro Infuser LE is geared more toward low traffic applications such as offices and home users.