Ooh I love a floor plan 
What's the total surface area of each house? House 1 looks bigger overall.
I don't usually like houses over 3 floors but I think house 1 works. It's basically a 2-storey house with a loft conversion (rather than a small 3-storey townhouse with living space over 2 floors, which I hate!) What I like most about it is the ground floor plan. I think the kitchen/family room/garden room will flow well and be a lovely space.
I dislike the ground floor plan of house 2. Weird to have a massive garage taking up so much of it! I've watched loads of home improvement shows and everyone ends up converting their garage into living space! I also dislike the long, thin kitchen/family/dining room - I think the family room will just end up being an awkward corridor.