I wonder if any of the bike techies can help me out?

I have 3 sets of wheels, 1 of which I need to sell to pay for impending race entry fees.

I have some Rolf Vector Pros (which I bought for a bargain used price), some Mavic Cosmos which came with my TCR and some good condition (used) Shimano 105 wheels which came with my Dads TCR.

I was thinking of keeping the Rolfs for my bike, and using the Mavics on my dads, as the 105s can fetch more than the Mavics.

However would I be selling some excellent aero advantage?? In other words, by using mavics instead of 105s will the aero disadvantage be much - if anything??

Sorry im so confusing! Thanks for any help

sam