This reaction is sped up in the presence of moisture or heat. While the multiple is still safe and effective, the smell is off-putting and usually not very well tolerated. Some people find capsules easier to swallow. This is often a function of size. Capsules are usually not as large as a tablet.
Some people prefer vegetarian multiples.
While some capsules are made from vegetarian sources, most come from animal gelatin. Vegetarians need to carefully read the label to ensure they are getting a vegetarian product. One concern people have with tablets is whether they will break down. Properly made tablets and capsules will both dissolve readily in the stomach. Some multiples are in time-released form.