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Virgin often has awards on Air France / KLM flights in the western EU for fewer miles but more fees and longer connections.
Generally, it’s best to use the airline you are flying to get a choice of seats and flexibility.
I use both airlines but book with the flyer. DC to Vienna is 12K + $150 on AF through Virgin but 20K + $80 on AF through AF.
By booking through Air France, I can choose my seat and get a very nice one, I can even buy an upgrade, I can get a 1.5-hour connection instead of a 6-hour one, and I can change my flights if need be very easily.
I do use Virgin Coach on VS award to London from DC though when stopping in London….10K + $152.