Use this site to determine what coin to mine based on profitability:
https://whattomine.com/If you're asking which coin is going to explode in the future, that's unknown, and probably no one can adequately answer that.
Thanks but what is your advice about graphic card ?
it's depend now the choice is about amd rx570 or 580 otherwise nvidia 1070 or 1080ti, 1080ti is a beast now costt is high but so the return, you save a lot of space and components if you go with the 1080ti, which is why i like big gpu