I like either but more often drink still water simply because I drink tap water. Sparkling water is more something I would order when I was out. I find soda water particularly good if I have an upset stomach. When I was young my grandfather made soda water with a soda syphon and a soda bulb (gas capsule). We used to love watching him do it and the soda water was considered wuite a treat.
I drink still tap water at home & also in a restaurant, & sometimes, when i remember too, i take a bottle of it, to drink while travelling, in summer on public transport, or in the car.
(Iím not the driver of the car!)
I prefer sparkling water which I became used to whilst on an extended holiday in Europe. Whenever purchasing at an outlet I was asked if I wanted "with gas" so no problem communicating with sales persons.