is more of a tank buster, has stealth, a good stun (if sent into a wall), an AD boost, and a dash on a very short CD (however it doesn't go on CD until you attack with the buff or it runs out), and less of a conditional speed boost in her passive, decent at getting away if ganked with her tumble and space creation with condem. And %max HP based damage making her better in tank meta.
has natural wave clear, AoE crits, ramping AS, a global skillshot ult (might be a pro or con), can root people conditionally, her skills scale amazingly with AD (10% toggled Q, 140% with W, and 10% bonus with her ult. (Ult also has 25/30/35% missing scaling making it more of an execute, unless you get a passive proc you're screwed if you're jumped due to the chompers arm time.
Personally, I love both equally, but if forced to choose one, it would depend on the meta. Tank like we're in right now
. Not a tank meta 
Just noticed their pictures face away the way I have them. Kinda funny at least to me...
Btw, just random:
For the emotes I prefer
laugh, dance and
taunt