I've been collecting both VHS tapes and DVDs of films for more than 20 years (since about 1983). I've found that unless tapes are played on a regular basis, their quality begins to deteriorate after about 5 or 6 years. The tape surfaces will "stick" together, often rendering them unplayable.
According to my research, DVDs will last indefinitely if reasonable care is taken. It therefore seems to me that the advantages of disc over tape are obvious.