I've never grown this, but looking at images, it looks like it would look better and more noticeable against a pale wall when in flower than a red brick one. But after 4 or 5 years it probably won't matter, because it'll be quite dense, with a height and spread of 8-12 metres x 2.5-4 metres and you probably won't be able to see the wall anyway.

this is a good link from the RHS
https://www.rhs.org.uk/Plants/16806/Schisandra-rubriflora/Details

it gives you horticultural advice and details of the flower size [3cm].