It's a toss up between spending more money on good quality fittings and fixtures with the knowledge that later down the line you have support network for them and therefore no need to replacing them making the bathroom serviceable for the foreseeable future without needing to replace complete fixtures
Or .....
can you be bothered replacing the whole fitting in 3-5 years when its parts start to fail and replacement components aren't available.
To be honest bathrooms can really be designed in such a modular way these days due to the breadth of fitting design, that replacing whole fittings can be relatively straightforward but again it's down to what you want as a customer.
Can you be bothered with the hassle of replacing the complete cheaper fittings & fixtures sooner or the easier, possibly cheaper servicing route of the more expensive fittings, when they start to deteriorate.
As mentioned buy branded products,for baths my first choice is carronite then Carron (uk made,well in scotland) They are more expensive than imports from china but quality comes at a price.
If your buying online from the numerous importing agents consider buying spares same time as the bath suite(although spares often very very expensive) as often spares wont be available in 5 years time. Wickes,b&q and many other type of places,at least you can see and have a feel of the goods before purchase,often unbranded but you have seen the product.
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