Selecting the best theme in WordPress is always challenging because lots of themes available in WordPress but final selection depends on the type of website and niche.
Hello the theme , is fair enough for selection but it is best for Elementor websites while GeneratePress is a very good theme.
It is true that the free version of WordPress does not give so much explore to your website as premium GeneratePress theme but you can start with GeneratePress.
If you are going to Start an Affiliate blog website then GeneratePress would be the best choice and I highly recommend it to you.
GeneratePress is Integrated Woocommerce so if your website is based on eCommerce or OnlineShope businesses then it would be a great choice.
If you want to go with free then apart from GeneratePress you can pick many other WordPress themes like Astra theme, Neve theme, and Schema theme.
So, in Hello theme Vs GeneratePress theme, GeneratePress is the clear winner and I would recommend it over Hello theme.
Kindly do comment that, is this information helpful for you?