Personally at initial stages of android phone, I mostly use google keyboard in typing messages. Then my friend adviced me to use swift keyboard.
But now I am very thankful to my friend because it is one of best featured keyboard I ever use. The thing I like most about is keyboard layout. moreover somer customisation are also available offline, to get more of it. Features like auto correction etc make it unique among others.
Every month I got some new useful feature from company side which makes it more ease to use. personally I am very happy with the experience I got from swift keyboard.