Having only owned one van a ci but worked on countless brands for a living the best quality in terms of build and durability do tend to wear German badges . This is borne out by the travelling community traditionally favouring hobby fends lmc tabbert etc .
That said I took delivery of 6 statics from trigano who are big players and each needed significant alteration to comply with our gas laws ( statics)
So really a case of getting a feel, and edging your bets.
There is a lot to be said if you can find the people or are able yourself to converting your own to bespoke specification. That said without getting involved in re plating there is still an element of considering materials in terms of weight and cost which all the manufacturers to lesser and greater extents consider ,,,,,that is the opinion I have reached