Dell G15 AMD 7840HS or Lenovo AMD 7435HS

I'm getting both of the laptop 4060 version at almost the same price.

The specs are: Dell G15 AMD 7840HS 4060 16GB RAM 165HZ screen 86Wh battery,

LENOVO AMD 7435HS 4060 24GB RAM 144HZ screen 60Wh battery.

I saw a few reviews that Dell has heating issues? is this true i live in a country where winters are cool but summers are extremely hot with 35 degrees Celsius. Which laptop has better thermals, better battery life, any difference in performace, build quality, etc.

I get 3 year warranty with Lenovo but only 1 year with Dell, in case of mobo problems will dell fix?, how is customer support?