We sell the Alltrax so I was going to stay out of this but it looks like the board is not offering much information.
From what I understand the Navitas control allows the user to adjust the motor field current varying the amount of torque or speed produced. This is a good idea in the hands of an engineer. When mis-used the motor suffers catastrophically.
The Alltrax leans more toward the bombproof user friendly type. It is reverse polarity protected and waterproof. According to Alltrax you can hook it up backwards and drop it in the pool
it will still work. It also has many user adjustments available. If for any reason it does not work it will be replaced for the first 2 years. It looks to me that BT connectivity is right around the corner for all of our cart modifications, chargers and controllers alike.
Their free software and user manual is here >
https://alltraxinc.com/alltrax-tool-kit/