Thermal advice

[tadams]

Looking to get into the thermal action. Tried it for the first time in Oklahoma on some hogs. I think it was the wildest and funnest thing I have ever done. I'm looking at either a AGM RATTLER V3 LRF 35 640 or the V3 LRF 50 640. Looking to coyote hunt and the occasional trip to Oklahoma for hogs. I'm just trying to figure out if the 35mm or the 50mm would be better for me. So any advice on my choices or other brands would be greatly appreciated. Thanks