<p>Or do you populate your form controls manually by a method?</p>

<p>Is either considered a best practice?</p>

It all comes down to how you want to layout your data.
If you need to control the layout (like tables versus CSS versus whatever), when use a Repeater or ListView. Between the two, ListView gives you a lot more events and built-in commands for editing, selecting, inserting. Additionally paging and grouping functionality. A Repeater is extremely simple, it repeats a layout with the data. Since you're building the layout by hand, Listview and Repeater require more code.
GridView is an updated DataGrid so there is hardly any reason to use DataGrid. GridView works really well when hooked up to standard ASP.NET datasources, but restricts you to a tabular layout with lots of layout rules. GridView requires less code since you're using a built-in layout.