Need recommendation for natural gas hot tub heater.

I have an outdoor electric hot tub that has stopped working and am converting the hot tub to natural gas. There is a 3/4 inch natural gas line run to the hot tub and I'm wondering if anyone can recommend a good natural gas hot tub heater. I have seen brands like Hayward, Minimax, Raypak and Jandy. Does anyone know if one of these is better than the rest? Thank you.