Negativity surrounding Ideal is centered around an older range that they used to make.
Ive been fitting them for ages and its the number one boiler that I offer my customers.
firstly the negativity isn't all about the boiler it is also about the appaulling lack of customer service, there inability to attend to a breakdown in under a week, their blame the installer culture and the shocking unreliability of every boiler they have made in the last 10 years!
as for your second comment, best of luck when they all start going wrong and come back to bite you on the a**e!
as for the op's question either the WB or the Vaillant will be ok, i personally prefer the vaillant as the diagnostics are superior and they don't sit in reset mode for half an hour if switched off!