The Time Patrol (for ages 12 and up) by Poul Anderson. The Time Machine (for ages 12 and up) by H. G. Wells. One is a collection of stories. The other is a short novel. Both are science fiction about time travel, but that is just about the only thing these books have in common.
Both are extremely good reads, though neither is suitable for a very young audience. The Time Machine is dense and takes a while to build up to the action. The Time Patrol deals a lot with time travel-related paradoxes, which can get confusing, and has some violence and some adult language.
The Time Machine is about a man in the late nineteenth century who builds a time machine. He travels to the year Eight Hundred and Two Thousand Seven Hundred and One A.D. (802,701). The book tells the story of his adventures with the people there, who are a greatly evolved version of the human race.
The Time Patrol is about Manse Everard, a man from the mid-twentieth century, who is recruited into the Time Patrol, an organization created to prevent anyone from changing history. The book has tales of his different missions.
If I had to pick which one I liked better, I probably would go with The Time Patrol, but I don’t want to rank them. They’re too different to pick a favorite. Both have excitement, but The Time Patrol has more. It also exercised my logic skills with time travel confusion. The Time Machine is more philosophical.
The Time Patrol and The Time Machine have a bit more in common than I said at first–they are both definitely worth reading.