Luggage racks are at each end of each car.
Leg room is the same everywhere and all seats slide forward to tilt. Obviously if you're seated at a table with 4 seats, you can't stretch out your legs. If you need a power outlet, pick a row with one. The refurbished Alfas will have an outlet at each seat.

Personally, I prefer to stay away from seats at the end of the car, as the ride is smoother in the middle and there's less noise from doors opening and closing as people move from car to car.