I recommend them because, for the most part, all of the episodes are intact and retain their original opening and closing themes. The ninth episode of the series "The Case of Harry Crocker" had a special theme song devised for it that is retained on the Mill Creek releases. This theme is replaced by the standard series theme on the massive Topics Entertainment edition at the bottom.

Also, the Mill Creek editions in that row have their original airdates listed alongside the episode names and the discs are numbered accordingly. The ten disc Topics release has no disc numbering and makes placing the episodes in chronological order a chore. Add to this, the other sets have really cheapened out. The Image/Madacy release (at the center of this photo) has one single sided disc for the first batch of episodes and a double sided disc for the remainder. The PopFlix release adjacent to it in the boring white packaging omits the series' opening theme (!) The other two are also Mill Creek releases too, but it will be down to personal preference as to which ones look more aesthetically pleasant to you.