Each comic has two or three stories of about 4-5 pages each...typical DC plots are :
1. Killer haunted by ghost of killed person who enacts revenge (typical in Ghosts)
2. Plot twists / surprise endings (typical in Unexpected)
3. Sell your soul to the devil plotlines
The actual settings are varied...and many more types but the above are a trend in my DCs.
HOM had the most variety...I'd definitely start there. If you don't enjoy that title then horror anthology just isn't for you.
If you want try it out... I recommend Showcase Presents Ghosts, HOM, HOS, or Witching Hour. They run about $16.99 to $19.99. They are black and white and not color with no ads.
Oh yeah, I forgot. Some of those are getting a little tough to find. I've downloaded some of the torrents since I have the physical book.
Sergio Aragones in HOM and HOS worth the price alone. Love that guy.