Well both the Referral and organic traffic is good.
Visitors will land on your website organically when they find you from search engines.
Referral traffic comes from other sites when he/she is looking for some useful information related to our website.
According to my opinion we can say this both traffic categories are most important for the business. But if we see in term of SEO we will require organic traffic for enhancing the ranking value on keywords.
Referral is good because you have achieved a rank where people know your brand and they type directly to come to you and on the other hands organic is still in progressive stage to become a referral.
Organic traffic is free traffic originating from search engines such as Google. It's the best traffic to receive because it means your website is actually being visited by people interested in your product or service.