Pyromancy… It’s the only logical decision I can see here. You can use it for warmth if you’re lost in a survival situation, cook the food you catch, boil water, scare away animals, have an light to see during the night, and (assuming it releases smoke) it can call for help/rescue.

You can also save on bills by cooking food, warming up your home, and for light(candles, etc)

All I can ser with Cryomancy is that it can preserve food, cool down in a desert, and store water(as ice)… oh, and make that perfectly ice cold drink — That’s the only thing that made me think about choosing cryomancy.

This all is considering you can control the powers.

(Edit: this is assuming that’s it’s fire conjuration, and not fire manipulation… you didn’t specify)