Yeah, if you can provide additional IR, I would put the favor into the mini-PTZ.
The firmware are two different types. The 49425 is the old GUI that if you have Dahua OEM cams in the past, it will be very familiar.
The mini-PTZ uses the new web GUI that not many are a fan of (basically because we are used to the older one LOL). But it has more functionality, including the ability to have many more profiles instead of just day and night profile of the older GUI.
The mini-PTZ has the newest tracking algorithm so it can predict where the object is going to get you past a pesky tree or something a lot easier than the 49425.
I also think being newer, the chipset/sensor on it is probably a little better.
But in a straight shootout of the two in a dark location, after about 50 feet out, the 49425 has the advantage due to better infrared.