Freire Chailly is one of the best modern recordings of these masterpieces, and has maybe a slight edge for me over Gilels (actually more over Jochum, it's the orchestra) in no. 1.
But the Gilels Jochum album was considered an absolute reference for decades.
Particularly in no. 2 Gilels really shines. And while the recording is pretty old (1972), the new 24/96 remaster is actually relatively decent with regards to SQ.
Here's my review of the Gilels album:
You'll find some more of my thinking around the two Brahms concertos and other favorite versions here: