they're both really good boilers and will last a long time provided that they are properly installed and serviced.
i'd personally go for the worcester, i've been working on then for about 5 years now and i've only ever had to repair 4 or 5 in that time due to a fault with the boiler, had to sort out a good few more than that as they weren't installed properly. not bad considering i see around 10 a week.
the vaillant's are also good but i'm not quite so familiar with them, i do know that they are very reliable however.
the most important thing with both boilers is that they are installed exactly as the manufacturer states - to the letter, and that you get a reputable person / company to come and check or re-set the combustion ratio's annually.
Ian
July 2010