Freestyle, backstroke, breaststroke, butterfly, which is your favourite??
I'm sure ppl love freestyle the most as it is fast and good for burning fat. And Breastroke comes as second, as it's most relaxing.
However, it's not that easy to swim fast and nice in breaststroke, as it requires the precise action and good cooperation, which normally ppl don't. Thus, formal lessons and regualr practice are needed.
For other styles,
It's cool that you can lookup to the sky in backstroke and you can have slimmer waistline and stronger arms and shoulders in butterfly.