Which one and why. This is not a BRAND issue either. Both are strong discs. I own both but have one in my bag. I am not neccesarily considering putting the other in, just curious to everyone else's take on them.
I always like to start with.... For ME... I found the Pred. to be longer than my Firebird, but the Firebird to be more stable than the Pred. Sooo, since I I need a overstable "fairwy driver" (Teerex over Pred for driver duty). The Firebird is my disc of choice. However, if I needed a pure driver. It would be the Pred over the Firebird. So as you see the Pred just doesn't fit my needs.
I have been playing for ten+ years and I have been using Firebirds since the beginning. It was the first disc I have ever purchased and I am glad to say I still use them religiously. Lots of disc molds have come and gone, but the Firebird has a constant presence in my bag. It is my go-to-disc for sidearms, tomahawks, windy backhand tosses, and short dog legs. I have six aces with six different Firebirds.
I have thrown both disc and think they are both great discs. I really don't find them to be that much alike though. I don't throw the Predator anymore because I only throw Innova discs. The predator goes further and has a more consistent mold. Sometimes you can have two firebirds and they fly and feel completely different. I prefer max weight flattop firebirds, preferably 11x. I like them because you can almost never throw them to hard. Both are great discs it just depends on personal preference. If you like a stable disc that has some glide throw the predator. If you like a stable disc that you have to throw hard and it likes to find the ground ASAP throw a firebird. I hope this has helped.