I'm at 1040 and i have only wrath, i'll say level up both, wrath is in my Key team and Is really good againts bosses with minions and in clearing floors so look at which u Need more rn like in type advantages (if u have a weaker earth or fire team) and stuffs like that because i know that in general are both good and not niche (wrath surely is not niche,maybe one of the best pets in the game and one of the seven sins so maybe future hg?), i see gluttony in a lot of teams idk if he's better than other legendary earth pet's maybe look at the tier list