Can we make an Initial Conclusion? Yes, but we need to allocate Numerical values (however said Numerical values were established on the Wiki and thru observation, since there is not an actual source for them on the patch notes).
Bombastic Demo Set:
Damage Bonus: 4
Freeze Resistance: 4
Bonus total 4, Resistance total 4
Volcanic Demo Set:
Charge Reduction Time Bonus: 4
Fire Resistance: 4
Bonus total 4, Resistance total 4
Mercurial Demo Set:
Damage Bonus: 2
Movement Speed: 2
Shock Resistance: 4
Bonus total 4, Resistance total 4
Kat Hiss Set:
Damage Bonus: 2
Charge Reduction Time Bonus: 2
Freeze Resistance: 4
Shock Resistance: -4
Curse Resistance: -2
Bonus total 4, Resistencia total -2
Starlit Demo Set:
Charge Reduction Time Bonus: 4
Damage Bonus: Slime: 2
Sleep Resistance: 4
Stun Resistance: -4
Bonus total 6, Resistance total 0
Mad Bomber Set:
Damage Bonus: 4
Charge Reduction Time Bonus: 4
Fire Resistance: -3
Freeze Resistance: -3
Poison Resistance: -3
Shock Resistance: -3
Bonus total 8, Resistance total -12
In a General observation the sets are quite well balanced among eachother, and that analysis includes Kat Hiss Set that is on the weaker side Resistance-wise, what Could be an Outlier Mad Bomber Set on the Bonus Total, get balanced thru Resistances, while doubling the Bonus substract four times as much resistance.
We Continue by listing. Sets that affect Bombs
Arcane Salamander Suit
Damage Bonus: Slime: 2
Damage Bonus: Beast: 2
Bonus total 4
Deadly Virulisk Set / Volcanic Salamander:
Damage Bonus: Slime: 4
Bonus total 4
Deadshot Set:
Damage Bonus: Undead: 4
Dragon Scale Set:
Damage Bonus: Beast: 4
Bonus total 4
Divine Set (Divine Veil being the part that provides the buff):
Damage Bonus: Fiends: 2
Bonus total 2
Heavenly Iron Set:
Damage Bonus: Fiends: 2
Bonus total 2
Valkyrie Set:
Damage Bonus: Fiends: 4
Bonus total 4
Fallen Set:
Damage Decrease: Fiends: -4
Bonus total -4
Black Kat Set:
Damage Bonus: 6
Movement Speed: 4
Fire Resistance: -3
Freeze Resistance: 4
Poison Resistance: -3
Shock Resistance: -3
Curse Resistance: -4
Bonus total 10, Resistance total -9
Chaos Set:
Defences: Normal-Elemental
Damage Bonus: 4
Charge Reduction Time Bonus: 4
Fire Resistance: -3
Freeze Resistance: -3
Poison Resistance: -3
Shock Resistance: -3
Curse Resistance: -3
Bonus total 8, Resistance total -15
Here We can see some Un-balance Black Kat Set being Somewhat stronger while the rest of the Gear remains in line with eachother, even Chaos Set doesn't deviate to much from Mad Bomber Set, again making more apparent the similitude between them.
We most keep in mind 2 things: First, the Bomber dedicated Gear is not un-balance, but can be considered a niche, what in a more general observation would make it look lacklustre; Second, The profound variability on missions and arcade level to level, where in some cases Bombs render some of the level completely Trivial.
The access to the arsenal on every level hinders some weapons and armours or Gear combination while boost others. As it Is the specialist weapons and Generalist Gear thrives while Generalist weapons (normal damage) and specialist gear (Bombs only Damage) tends to suffer.
With the exception of some gear, the game is not in a bad place from this list point of view, but we need to consider that this is the observation of only 1/3 of the game and the state of it from said perspective.
Let's Notice this:
I haven't Analyzed DPS, which I wont Until Official Data on Charging Time values and Charging Time Reduction is Disclosure