Honestly, from what you are trying to do, both the Apollo and FF800 are both way too much interface for your needs.
That said, can't go wrong with either one. The advantage of the Apollo is that it basically has a UAD card inside of it, allowing you to run pugs off the interface instead of from the computer. Otherwise pretty even IMO, RME has great drivers and conversion, I'm sure the Apollo has comparable conversion, most likely the drivers are fine as well.