[FearTheDragon]

What is the best ancient in the game?

[Galliant]

There is defacto no best  ancient. 
There are roles which they need to fill.
That said,  a wall ancient cannot be the best ancient since it'll be horrible as a sweeper.

I'd however advise getting either Sarcuda or Vydral since they are beast in PvE.

[freak500]

We already gave you the correct reaction right?

The problem is that you don't understand the roles and how the dex work. As stats? Orogond? As for pve/pvp. On pvp most ancients have other roles make them good against something else. Still on pvp a emissary can take a lot hit of almost any ancient.

So when you want to start to understand the game, check all the threads galliant made. There is no 'best" since every monter takes a role. Like on the real pokemon game, there is no best.

[BloodyFate]

For me, the best is whichever monster that I prepare to battle with.

[ZekeYer]

Titanisaur: Titanisaur is a massive ancient monster with exceptional defensive stats. It can withstand heavy damage and serve as a reliable tank in battles. Its ability to learn a wide range of support moves, such as healing and status recovery, further enhances its utility in team compositions.