Yes both Assam and Meghalaya are vibrant with nature, don't miss out on exploring shillong, Majuli, Upper Assam, Mawphlang sacred forest and Dibrugarh.
Both the states have lots of places to explore. I will suggest you to visit one state at a time. Apart from Cherrapunji and Cleanest village you can also plan to visit Dawki a small bordering town in Meghalaya known for its crystal clear water of the lake . Every state has its own flavour and minimum seven days is needed to get it's feel . Hope this helps.
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Absolutely, you can club Meghalaya and Assam in a 9 day trip. you can check our Assam tour packages by eSikkim Tourism who often club places like Shillong, Cherrapunjee, Kaziranga, Guwahati etc.