Do not take pictures of the partially eclipsed Sun unless you have a filter safe for both photographing and viewing the Sun, and know what you are doing . Load camera with fresh batteries before the eclipse begins . Pros and cons exist for both. However, print quality will depend on the quality of the processing lab unless you do make your own prints. Slide film gives a first generation picture so you can judge the result.
Prints are easy to view but projected slides produce the most breathtaking pictures.
If available and affordable, use professional film. If you intend to use slower films, bring some fast film too if you have to shoot through attenuating clouds. Use Fast Film. If you cannot use a tripod or other stable support, use ISO 400 or faster. But use fast films if you just want to photograph the landscape.