Since I haven't read the books in question (time is in short supply and my "to read" pile only keeps growing) I bought George Hill's "Uprising USA" for my wife, who makes time to read zombie books.
Zombies are a great vehicle to talk about survival, tactics, disaster prepping, and surviving TEOTWAWKI after a SHTF scenario. Obviously Zombies aren't real (although in Chicago and Louisiana the dead have been known to vote Democrat) they serve as a pretty good generic disaster.
So my wife read the Jesse Petersen "Married With Zombies" trilogy, and I asked her to compare/contrast with George Hill's "Uprising USA" as I being me was interested in her opinion.
The biggest difference I noticed is that she giggled when reading "Married" and asked a lot of questions when reading "Uprising" I had to explain to my wife a lot of the gun/military jargon. After all George dropped a number letter acronym almost every page "FN SCAR, AR-15, FS2000, Carl Gustov, 5.56mm, 6.8 SPC, Savage 10FP" which to someone who isn't abreast of the latest in gun technology caused my wife to turn to me and ask "what is this?" My normal answer was, "a black military looking rifle" until we got to the Carl Gustov, which I shortened to "rocket launcher." For "MOAB" I answered, "Mother of All Bombs"
What follows is my wife's words, paraphrased by me.
The tactics in Uprising USA are much better. "Married With Zombies" was a comedy, and "Uprising USA" is in an autobiographical fiction. "Uprising" is a more of a believable read than "Married with Zombies."
I could see where the political ramifications of trying to hold some semblance of government together in "Uprising", much more believable than in "Married With Zombies" where they just built an "eastern wall" that segregated the nation at the Mississippi River. I like the creative licensing that George Hill used to create "Master Zombies" or "Red Eye Zombies" which was definitely a different twist on the Zombie genre. There are a lot of unanswered questions that I hope are answered in "Uprising UK."
I don't think I was the target audience for "Uprising USA" as it had a lot of military/gun jargon that I had to ask my husband for clarification.
"Uprising" was about building a group and going out and organizing, where as "Married" was about survival and making it to the wall. There really wasn't a sense of purpose in "Married" other than personal survival. George Hill kind of glosses over interpersonal relationships in "Uprising" where "Married" focused on relationship survival.