Both don’t shine against the same things…
You face gemini or ardentis?thyla won’t do a lot and will surely die because he can be slow,just pray to not receive 2 crit in a row so you can deliver this mighty 75% hp dmg
in the other side?allo can’t be slow,so first turn,you deal huge dmg,you won’t be slow and you finish them with 60%hp dmg
You face an edmontoguanodon or paramoloch?
well your alloraptor can be stun allowing eddy or a set up para to finish you easily
While thyla don’t care because he can’'t be stun
both are good against stegodeus,first can use bleed ,the second just have to use defense shattering impact and rending attack
Same against trago:even if thyla is slower,he can’t be stun and invincibility won’t be a problem