Since we are talking about Tera again, I'll just state that it pretty obviously helps offense more than defense. Like most things in gen 9. Outside of Tera Blast, which is purely offensive and has been a recent discussion, the same type Tera sets get a significant boost in power that can help break through defenses. Even defensive Tera often allows setup sweepers an extra setup turn. And many Tera types like Fairy or Ground can be used for both offense and defense, further helping setup sweepers.
So to summarize:
Extra STAB = Helps offense
Double STAB = Help offense
Tera Blast = Helps offense
Defensive Tera = Helps defense, but also setup sweepers.
Basically, every aspect of Tera helps offense in some way. Only defensive Tera helps defense, but it can still be used to help offense.
I think I would appreciate Tera a lot more if there was something to balance this like an item requirement. Stacking bonus multipliers from items and/or abilities for free with almost no limits also just inherently favors offense.
The main bonus multiplier items for defense are Eviolite, Assault Vest, and the terrain seeds. The first two come with severe downsides and a vulnerability to Knock Off. The seeds are good items, but conditional and only proc once. Even Booster Energy is used for offense the majority of the time because it is typically a superior use of it.
The gap between offense and defense is further exacerbated by Tera only giving bonus multipliers for offense and not really for defense. Although the type change helps, and can half, quarter, or even in some cases nullify damage from specific attack types, it's not the same as the threat level of offensive bonus multipliers stacking with Tera's multipliers. The math definitely favors offense in most cases.
So to summarize:
Extra STAB = Helps offense
Double STAB = Help offense
Tera Blast = Helps offense
Defensive Tera = Helps defense, but also setup sweepers.
Basically, every aspect of Tera helps offense in some way. Only defensive Tera helps defense, but it can still be used to help offense.
I think I would appreciate Tera a lot more if there was something to balance this like an item requirement. Stacking bonus multipliers from items and/or abilities for free with almost no limits also just inherently favors offense.
The main bonus multiplier items for defense are Eviolite, Assault Vest, and the terrain seeds. The first two come with severe downsides and a vulnerability to Knock Off. The seeds are good items, but conditional and only proc once. Even Booster Energy is used for offense the majority of the time because it is typically a superior use of it.
The gap between offense and defense is further exacerbated by Tera only giving bonus multipliers for offense and not really for defense. Although the type change helps, and can half, quarter, or even in some cases nullify damage from specific attack types, it's not the same as the threat level of offensive bonus multipliers stacking with Tera's multipliers. The math definitely favors offense in most cases.