There are basically 3 categories of tools
1. Speed booster (Kero or Moonshine)
2. Turn booster (only the P.C. sadly, muse add a Moonshine version of PC pleaaase)
3. Counter tools (Hyro, Chute Vent, Drogue Chute, Tar, Impact Bumpers
(often times tools are used effectively in other roles, this aint every use)
(also spyglass and range finder are not included for obvious reasons)
Generally you want to tailor these categories for what your ship goal is.
A basic all rounder kit in the same vein that mallet spanner chem is an all rounder engineer kit would be one of each category as it gives you two movement buffs and then something special. Meta midions commonly have moonshine/kero, phoenix claw, and hydro. Other more specialized ships might take more counter tools than movement tools. It depends.
Personally here are my general loadouts (when I remember)
Junker, Kerosene, Phoenix Claw, Drogue Chute/Hydrogen/Tar Barrel Depending on mood and enemy
A good all rounder array of tools for a good all rounder type of ship.
Goldfish, Moonshine, Phoenix Claw, Chute Vent
Its a blenderfish, and I go ram happy making the Moonshine and Chute Vent a must
Squid, Kerosene, Phoenix Claw, Hydro
My Squid needs all the speed and maneuverability it can get to make up for bad decisions from the captain concerning engagements.
Galleon Moonshine, Phoenix Claw, Drogue Chute
Galleon need the Claw due to its abysmal speed. Also Moonshine is the only booster that feels strong enough for its mass. Drogue is nice due to that big balloon being a common target.
Mobula, Hydro, Chute Vent, Drogue Chute
Mobulas are damn hard to efficiently repair meaning that engine burns are need to be done sparingly. However this loadout both utilizes its amazing balloon and protects from balloon poppers. I am no mobula expert though.
Spire, Drogue Chute, Phoenix Claw, Hydro
Like the mobula, this is another ship you don't want to burn too much enginer however sometimes a short PC burn is needed. However this too is not a ship I am an expert on.
Pyramidion, Moonshine (kero if CP) Phoenix Claw, Chute Vent
I don't fly a lot of pyra but when I do I like to play agreesive and ram a lot mainly because my normal junker never gets to ram. These are the tools to do it.
So here are my tools. Other pilots bring other tools for great reasons and it will vary from player to player. Hope this helps.