Chan... Taken from that WhatCar link...
AUDI A1: "According to our latest reliability survey with Warranty Direct, Audis don't always live up to their prestige image, so we can only hope that the A1 will perform better than the older models."
AUDI A1: ..."the rear seats are best for children due to the dramatically sloping roofline. The rear seatbacks are almost vertical, so may be uncomfortable on long journeys."
HONDA JAZZ: "However, the Jazz has finished top of the supermini class in our JD Power customer satisfaction survey for the past nine years, so it should prove very reliable."
The WhatCar article does praise the Honda's 'space and versatility of a much bigger car' but omits to specifically mention the versatility of the unique Magic Seats and its truly astonishing rear seat space for passengers... given the size of the car. Great view out for rear seat passengers, too.
I was in the back seat of a Volvo S80 the other day... yes, being an 'executive' car it had better noise suppression, ride and seat comfort than the 'economy' Honda... but the little Honda's back seat is easy for entry/exit, has good leg and headroom and is acceptably comfortable. Though more noise than I'd really like. At 6'1" tall I've sat 'behind myself' in the Jazz with my 6'3" son driving... comfortably for 3 hours. In the Jazz, not a hint of that claustrophobic feeling you so often get in cars' back seats... such as the back seat of the 'executive' Volvo S80 I travelled in.
Anyway, you'll have your own reasons for choosing and best of luck either way, Chan.