It's night and day with the plant growth rate and structure and all. Overall, the Forum looks wider, more purple, more mint and way more chocolate, much more blunt wrap flavorful is a way I'd put the Forum but it's very pleasing where as I hate blunt wraps and the artificialness...lol
The DHN is frostier, greener, longer & thinner flower and much more OG with it's odor and flavor, it expands like a neutron bomb though. No real chocolate odors in it, but some mint but more of a unique potent OG odor that I really like. The Forum crushes the DHN for plant structure and the flowers are almost equal to me in different ways...but If I had to pick one, it'd be an easy choice: FORUM GSC!