I'm going to resolve this conflict once and for all by DPS testing certain summons against The Twins.
DAMAGE RATING SYSTEM (lowest to highest) F, E, D, C, B, A, S, X (Ideal rating is S, X means OP)
AI RATING SYSTEM (lowest to highest) durr, Stupid, Bad, Decent, Good, Smart, Einstein (Ideal rating is Einstein)
VAMP FROG
Gyazo
This thing is OK against ground enemies, but pales against bosses even BEFORE its level.
DAMAGE: C
AI: STUPID
NEEDS
DAMAGE and AI BUFF.
SPIDER
Gyazo
It's pretty powerful... if it is able to reach the enemy. I propose simply making it able to fly at targets.
DAMAGE: A
AI: DECENT
NEEDS
AI BUFF.
IMP
Gyazo
haha it's even worse than I thought 11-24 DPS
DAMAGE: D
AI: BAD
NEEDS HUGE
AI and DAMAGE BUFF.
BLADE
Gyazo
It's not got the best DPS in the world, but it's really smart.
DAMAGE: B
AI: EINSTEIN
SPECIAL MENTION
Gyazo
haha blade + ichor + good tag damage combo go brrrrrrr
(the start of the gif shows the blade doing ludicrous DPS [which then diminishes as the tag and ichor wear off])
THIS UPGRADES THE DAMAGE TO: X
MAY EVEN NEED
DAMAGE NERF.
SANGUINE
Gyazo
The best summon to get for it's point in the game if you aren't willing to use Golden Shower (stupid) or not prepared to go close and use a whip (smart, except in the case of the Blades)
DAMAGE: S
AI: EINSTEIN
PERFECTLY BALANCED, LIKE ALL THINGS SHOULD BE.
HOWEVER, NEEDS AN
ATTAINABILITY BUFF.
DRAGON
Gyazo
An incredibly powerful summon that is a great choice for ML. Def needs a nerf.
DAMAGE: X
AI: SMART
NEEDS A
DAMAGE NERF.
CELL
Gyazo
Actually a very decent summon, but it has the incredibly bad fortune to be competing with the Stardust Dragon.
DAMAGE: A+
AI: SMART
NEEDS A
DAMAGE BUFF.
XENO
Gyazo
Whoa... This is actually much better than I thought... The best summon at this point, replace the Blades and Sanguines with this.
DAMAGE: S
AI: EINSTEIN
PERFECTLY BALANCED, LIKE ALL THINGS SHOULD BE.
*Note: At this point I had to murder the Twins and spawn another lot as Spaz was getting dangerously close to phase 2, which has higher defense and is faster.*
SLIME
Gyazo
So the Slime has better DPS than the Hornet and just as good DPS as the Imp. Think about that. (Note, just after I recorded this GIF, the DPS went up to around 13)
Unfortunately, it's near impossible to obtain early enough.
DAMAGE: A
AI: GOOD
PERFECTLY BALANCED, LIKE ALL THINGS SHOULD BE.
HOWEVER, NEEDS AN
ATTAINABILITY BUFF.
FINCH
Gyazo
Oh... Oh dear... This thing is just... awful...
DAMAGE: D
AI: BAD
NEEDS AN
AI and DAMAGE BUFF.
ALSO NEEDS AN
ATTAINABILITY BUFF.
PIRATE
Gyazo
Huh, this is so much better than I thought. Still, it can't fly, shame.
DAMAGE: A
AI: BAD
NEEDS AN
AI BUFF.
ALSO NEEDS AN
ATTAINABILITY BUFF.
TWINS
Gyazo
The Twins appear to be good at bosses, unfortunately the Blades and Bats are better. Oh, and the Twins are further on.
DAMAGE: B
AI: DECENT
NEEDS A
SLIGHT DAMAGE and LARGE AI BUFF.
PYGMY
Gyazo
It seemed OK (not good though, remember this is a post-plantera summon) until I flew up. It stopped attacking immediately to catch up. Unfortunately, 90% of the time during battles you are flying.
DAMAGE: C
AI: durr
NEEDS A
LARGE DAMAGE and RIDICULOUS AI BUFF.
TIGER
Gyazo
Oh well... It seemed really good until I flew. Then it pulled a Pygmy Staff.
DAMAGE: A+
AI: durr
NEEDS A
RIDICULOUS AI BUFF.
RAVEN
Gyazo
Same as above, except the Raven isn't that good for DPS for how it is obtained (pumpmoon is so difficult!)
DAMAGE: B
AI: Stupid
NEEDS A
DAMAGE and LARGE AI BUFF.
DEADLY SPHERE
Gyazo
Same story as the last few, offensively bad when flying, which is like 99% of the time.
DAMAGE: B+
AI: Bad
NEEDS A
DAMAGE and LARGE AI BUFF.
SHARKNADO
Gyazo
This is so inaccurate it's funny. Remember the only bosses after Duke are EoL and ML, both of which are MUCH harder to hit than the Twins. (Suggestion: Make it home)
DAMAGE: A
AI: durr
NEEDS A
HEAVY AI BUFF.
TERRAPRISMA
Gyazo
Ok, so it may look like it is only half as strong as the Dragon, but a 2-segment dragon isn't twice as strong as a 1-segment dragon, whereas 2 terraprismas are twice as good as 1.
DAMAGE: S
AI; Einstein
PERFECTLY BALANCED, LIKE ALL THINGS SHOULD BE.
P.S Most summons have very respectable DPS. The problem lies with the fact that 90% of the time, you are going fast, which means that most summons will drop attacking to follow you, stopping their damage output in its tracks.
The problem with summon balance is that you will always be able to do this:
Gyazo