6 of 1 & half a dozen of the other between the two sides of the case.
Sometimes due to commercial pressures, time taken to descend from cruise and brief for an unknown airport (who in Russia, may or may not in reality have the fire cover you'd expect
etc) with potentially high MSAs, the prospect of continuing can look quite attractive.
At the end of the day, the decision remains with the crews. My concern would be whether the fault was not the SDCU but infact the ECAM! From 11 100m with a high speed descent at close on Vmo/Mmo to a field that you are familiar with and with 2 sets of approach plates (some companies only carry the one set for alternates) may be almost as quick as overhead div.
From a two crew perspective, it would be much easier to get back into the loop (and remain SA) at a familiar field from a NPF aspect after briefing the crew, pax, company etc.