Kindly refer to the following link(s):
Do I pray witr with the Imam in Ramadan
Praying Witr with the Imam in Ramadan - reward for praying the entire night
Imam makes a very long Dua in Witr (Qunoot) shall I pray Witr at home?
Imam prays witr like maghrib, I pray Taraweeh with them but pray Witr at home
Do I pray Witr with the Imam in Ramadan if I want to pray Tahajjud at home?