Mice are as easy as rats. Like any pet, if you socialize with it, it will be friendly. I've had mice and rats. I do like rats better though. Bigger and easier to handle than a mouse if you want to hold it. My favourite has been my hairless rat, Saggy, had her about 4-5 years before she passed of cancer. Mice and rats are easy to feed, guinea pig/gerbil food, Saggy liked dry cat food once in awhile, too, they will eat anything, raw vegetables as a snack once or twice a week, and salt blocks to lick and chew. Change water bottle everyday. Wooden toys, Saggy loved toilet paper rolls to rip and make bedding. Fill bottom of cage with shredded newspaper, and cedar shavings and change once a week.
Good luck! 
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