Out of the two Pep wanted Stegen the most. Both were good options for Pep in general at the time (Before Bravo's meltdown). Stegen was younger and had a lot of potential thanks to his technical qualities that were better than Bravo's despite him not being a slouch himself either.
When it was clear we wouldn't budge from our 80 Million asking price (Stegen's buyout) Pep decided to go for Bravo instead which like I said wasn't a bad option at all at time time before it all went to hell for him this season.
I think out of all the young GK's out there that suits his system, Mats was very likely his number 1 choice and for good reasons. But at this point it's more or less a dream now for Pep since there's no way we will consider selling him now that he's our number 1 GK.
At this point I think he will go for Benfica's Ederson Moraes, who himself also fits what Pep wants out of a GK and he's also young and talented.