Which Avenger

Jalter all the way.Party wide ATK boost,buster single target NP,50% buster boost for 1 turn(max 3rd skill),star absorb and 50% crit damage up(max skill 1).Highest max ATK.You don't need another Avenger after you get her.

All Avengers have a similar flaw: durability. They tend to have very low HP values and don't have any survival skills. They traded that off for insane attack stats.

Jalter is incredibly squishy but her 3rd skill slightly helps with that. She does great buster damage and crit damage and can contribute to the team with her 2nd skill.

Gorgon performs slightly similar except she doesn't have a star gather skill, which hinders her crit abilities. Her attack up is also targeted only to herself so her skills are a bit more selfish. She does have a stun skill, but its only reliable in higher levels. Her NP is AoE and since she is an Avenger class and possesses a high attack stat, she can be used as a farmer or wave clearer.

Dantes does incredible AoE damage and can semi-spam it due to his NP being quick and having high hitcounts. This means he can get a decent amount of NP refund, although his skills are quite mediocre. Until he gets his strengthening and Skadi arrives, he won't be performing quite well in comparison to other servants.

I recommend Jalter since she will be more relevant and is one of the best among her roles.

The Strengths of Gorgon:
1. Huge Asset.
2. Seriously it's 'thick' dude.
3. She's gorgeous.
4. The main strength have been explained by other people.
The Strengths of Jalter
1. Jannu face.
2. She burn's everything !
3. Strongest Avenger yet.
4. The main strength have been explained by other people.
You can use both to wreck things anyway lol

I mean, Gorgon will definitely be easier to get.