First of all, let me say, Red Angus is my favorite breed of cow.
Those red calves may not have sold quite as well as black ones in the past,
but I think that day is over. Red Angus has a lot going for them. As far
as performance, I think you'll find they'll do as good or maybe better
than the blacks, depending of course, on their genetics.
If I had the opportunity you have, I'd jump at it. FWIW
Back in 1979 when we were changing from Herefords, I wanted Red Angus,
but there weren't many available to buy.
I agree with Loomixguy. How could you go wrong if the price is right?