Should I forward domain or same site under two domains?

I have 2 different domains https://chilizprice.com and https://chzprice.com

They will have the same info on the sites as you can guess. At first wanted to make the same site and publish them under different domains but I read it may be bad for SEO. Now thinking to forward the chzprice.com to chilizprice.com. This will be less efforts for me but I do not know how it will effect the SEO. And how can I make SEO in that case for the forwarded domain? I am very new to web and SEO so any ideas and suggestions are welcome.