I loved my old pair of fireblades. The fireblade fits a bit wider from the midfoot to the toes than the crosslite. This is partly due to the different lacing systems, but the fireblade also has a much wider forefoot shape.
The fireblade is slightly thicker and overall it is more durable. Both these shoes however are in sportivas lightweight trail running category. Have you looked at the skylite? It's the same shoe as the crosslite but with a different, less-aggressive tread.
Comparing the fireblade to the wildcat isn't really a fair comparison. The wildcat will definitely last longer, but will also feel more clunky and like a platform under your feet. The wildcat is in the midweight category and provides a lot more cushioning, stiffness, and durability. My pair of Lynx shoes, which are very similar to the wildcat, have lasted far longer than the fireblades.
My fireblades held up reasonably well. I would still be wearing them if not for the slight posting that they have. I supinate and prefer neutral shoes.
For me, the fireblade is one of the best fitting shoes I've ever worn. Narrow heal, wide forefoot. Perfect for me. And they're orange!