Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 2 months ago

Yes it is better to pray with congregation than praying alone even if the congregation is with Sunni Muslims. When you pray in congregation with Non-Shia Muslims, you need to recite Al-Hamd and other Sura yourself but with out clear voice.

 Wassalam.