Taking into consideration the following question: An order form provides these options from which customers can select one option: autocomplete, checkbox, radio buttons. According to the best practices, why the autocomplete is the best UI control type to minimize clutter on the order form?
Based on the UI controls we provide OOTB controls to capture the user inputs. Dropdowns, Radio Buttons and Autocompletes provide a user restricted selection option where the entered data cannot be dynamic but has to be chosen from the respected list. Among these we make the classifiaction based on the options count.
If the options list count is 2-3 Radio buttons is the desired choice, if the list is bigger than that we go for dropdowns and finally for lists that has a large data set we go for autocompletes as there we have the provision to choose use keywords to filter and share the best possible match.