Out of all of the pets, which are the most beneficial for Battles and why?

I really like Borik. His transformation special skill is kind of feels like cheating it is so OP. I also use Vile Warlock for his health regen. Vile Spirit's Poison special skill can be good for doing little bits of damage and can be pretty good for knocking off a strong opponent in arena by Poisoning and hiding. Boxer's Silence is useful for getting a good start on Arena AI battles because the AI doesn't run away and his soulstones are easy to pick up for faster evolutions. Silence isn't as useful for PvP because real people will just wait that couple of seconds until they can fight again. Pyrotaur shortens the number of hits needed for parry breaking, which is good for Team Instance boss battles if your team focuses on using their main skill with the intention of breaking parry. Boxer's Silence can be used with increased parry-breaking for an extension on fighting without the enemy fighting back,

I like captain sam and nezha they both good for pvp and pve

My Top 5 so far,I've seen do lots of damage to me or my opponents also helpful abilities during combat,also I heard that are good

1.Captain Sam -can transform into him and do a lot of damage in pve and pvp,plus stun.-fought people who have him

2.Borik -does a lot of damage,as well can heal while transformed as him,and do a lot of damage. -fought people with him and fought people who have him

3.Hades -He can do a lot of damage as well,(only saw him doing damage with other players,pve)-also heard he was good

4.Boxer -the easiest companion to evolve since you get his soul stones from daily login,also has a useful stun ability for pve and pvp and does a decent amount of damage -fought people wit him and people who have him

5.Dingus-So far I've heard he's decent against captain sam (who can stun you until your dead) his ability can remove beneficial effects from your enemies.-fought people who have him as well