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Thats pretty much bs, every installer has there preference. The years of shit boilers and one manufacturer being better than another is really over. They are all offering long warranty's on them now. Worcester as much as they win which are so over priced its unreal.
The new Baxi stuff is pretty good, weissman's are decent as are valliant but they all have long warrantys now which you just pay for in the price of the boiler. Worcesters are the worst to work on from experience.
I don't think reliability is anywhere near Vaillant though, although it's a while since I researched boilers. All the good installers seem to recommend Vaillant.