I've used Shutterfly for a variety of trip books and been pleased. I've used premade templates/layouts and done some more creative ones. Especially if this is your kids' first foray into trying this I would start with Shutterfly. It's pretty user friendly and easy to work with for beginners I think.
One piece of advice I would give is that I found dropping in text boxes that describe some specific memories, events, funny quotes, etc. are a great way to remember parts of the trip. The first few books I did had a lot of captions for our phots (i.e. Fun Time, Travel Memories, Great Day, Night Out, etc.), but the ones I've done later I make a point to also include some specific memories of the day. Some favorite things we saw or did, funny recollections or thoughts, notes about the weather, silly quotes you remember, descriptions of food, specific recollections of experiences or memorable moments (big and small). They don't have to be essays or anything like that, but I found some specifics in addition to the fun captions really help keep the trip alive in your memory and add a lot to the photo/scrap book. Just my 2 cents
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If they really get into I bet that by the time the holidays roll around there will be some coupon codes for a higher quality option if you really feel you need it, but I've been pleased with Shutterfly's quality and layouts. What a trip of a lifetime to document and remember! Hope they have fun reliving it.
