Airgun rule #1: The fps numbers by itself on the box are stricly marketing speak only. It doesn’t say anything about the performance at all, let alone make a comparison between two. The reason why they still put those numbers on the box is because it sells! (Mine is bigger/faster/smarter then yours!) Not so much in the serious airgun stores anymore, but still in the Waltmart/Target types where the uninitiated people get these as toys. Yes, although the airgun world is growing rapidly, most ppl still see them that way, firearms are the real mccoy. Airguns are just toys for kids (young and old) because the bb guns of old is what they grew up with and still their only knowledge about them.
About the higher numbers a funny side note on this is that the Dewalt 20V cordless tools in Europe are branded the Dewalt 18V cordless tools. (as such printed on the batteries and the tools) As are in fact ANY of the other toolbrands out there in the US, they are really 18Volts. (in EU it is prohibited by legislation to mislead customers with false performance claims) But some tool manufacturer in the US put 20V on them, So it looked ‘higher’ performing as the number was more than 18, so Dewalt had to follow, because if they had stated 18V(again; which they ALL really are...) , that would be less than 20, And then they would be rated by the buying public as worse than the other brand, right! So the 18V are called 20V in the US as that makes them equal to the competition... And all the other cordless tool companies followed suit of course ;-)
Ok now back to the program:
The fps only holds merit if it’s in conjunction with a pellet weight and or an energy level stated. If it’s not then they are derived from the very lightest alloy pellets and they are most likely garbage for accuracy. But hey a large number looks great, so it must be good! (As explained above: for sales it still is ;-) )
The Unarex comes with a very finicky loading magazine, rotate the plate put the first pellet in backward(!) then do the rest of the pellets. Looks like a copy of the marauder type. A lot of Americans love the mag, but it’s still a very awkward way of loading pellets. (I’ll probably get roasted for this as for many it’s the magzine they grew up with, so it holds sentimental value...)
They both come with a fixed parallax scope, which is fine for plinking beercans, but if you plan to do anything “serious’ with the gun (i.e. hunting or target shooting where you want to have the utmost accuracy), get rid of the scope immediately! Fixed parallax is fine for firearms shot at 100y and more, but not for airguns shooting from 10 to 50 yards!
As for accuracy both are new so probably not many ppl have experience with them yet, you want to search for reviews on UT, then you can see how they perform. As they are both entry level, I suspect that they are more targeted (pun intended ;-) as plinkers, but maybe you could be getting reasonably accurate results (say 1,5 - 1,75 inch at 25 yards). But you have to try all different pellets to see which perform best for that particular gun.