I recommend Fed. 
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 You would've thought that there is an alternate ending because Mira Grant wanted you to have a not-so-earth-shattering ending compared to the real ending of Feed. Goodness, think again. Mira writes to torture us Newsflesh fanatics. Torture, i tell you! :) 
 I still liked the ending of Feed after I read Fed. I mean, if i have to choose heartbreak (Fed) over the previous bigger heartbreak (Feed), i'd choose Feed's heartbreak. I say, why not go for the bigger kill eh, Mira Grant? Just finish me already! LOL