A sports watch will usually be somewhat larger than watches intended for more formal occasions, however, watches in general have grown larger over the past few years. Choosing a sport watch that is not large enough on the face of the watch to easily place and read all the features is a waste of money. At the same time, choosing a large bulky watch can interfere with playing some sports, and can even be dangerous to the player in others. Catching parts of the watch on other objects is hard on the watch and may cause injury to the wearer as well.
The dial should be large enough to easily read the numbers and view the placement of the hands. A luminous dial is helpful in some situations. Placement of the hands or the digital readout should be done with readability in mind. If there are other features on the face of the watch, they should be intuitively placed and easily seen. Hands versus display are a matter of personal preference.