Having it as a blog post would increase the domain authority in Google's eyes. But on the other hand, having a blog post dedicated to talking about your main co

Having it as a blog post would increase the domain authority in Google's eyes. But on the other hand, having a blog post dedicated to talking about your main competitor would probably be detrimental in converting more customers. This is the best compromise. A separate site to discuss the situation. With many links to the main product site to pass through some of the domain authority as well.