I like very much Coldplay, their songs have good music and lyrics. I like Trouble, Talk, Yellow, Lovers in Japan, and recently Sky full of stars and Miracle. I don't know Imagine Dragons so you suggested me a new band.
I don't care which is better, i love them both)
I love a skyfull of stars but the remix od Hardwell(first DJ in in the world)
My favourite songs of these bands are Demons and Paradise.
I like Coldplay for their song "A sky full of stars" and "Viva la vida".