man I don't know how to elaborate with my English which is bad.
For me thickness of handle, the wings, gluing of handle, hardness of handle, gluing of different handle material, qc of material is different in every koto alc blades.
LGY ALC is soft as KH, and has long high throw, and every shots are going long, which can be good choice for D09C but it is really soft and you can feel how much you can feel ball pressure on handle but it is better 1-2 metres away, good alternative for limba alc with more direct shots..
ZJK ALC is harder because handle absorbs some energy which add some extra HOLD to the top and gives you more natural force if you have enough force in wrist to put the energy to handle, for me it is better choice for blocking style or aggressive in table play but the most important thing is your size of hands. Big size hands = you will like it you will put more force to the ball and be more aggressive after ball kick.
Viscaria alc, for me it is medium soft, for me is the most allround blade for using hard chinese rubbers, you can play passive and aggressive and the weight is more on the low side, which is more on the wings+handle,
sometimes the weight balance is medium (low weight of blade, empty feeling) but top of the handle is narrow, it gives good flex and forward speed it is wrist friendly because just to get good amount of speed you will move your wrist faster.
If LGY (in moving the ball to forward) is very speedy, Viscaria is only speed friendly and ZJK is not moving forward the ball very fast.
TB ALC, for me the sharpest, the most aggressive it is like pimped by F1 team and it gives you careless feeling what type of rotation your opponents put on your side if you read the time, the amount of spin and your stroke is really good, you will use opponents quality to play more quality balls but you must be very good because if you are not in the zone you will get too much errors.
And for example, not specific numbers around 1000 hours later and 20 glued rubbers, the material koto alc is deforming and glue will pull away the SPEED of fabric glued koto-alc material which makes every blade very near their own formula. People after changes must stay with the same handle because if it suits you, what you can change?
AND another opinion. the characteristic of every blade can be different because wood sink in arylate carbon and the characteristic of "the blade" will be the same because sometimes artificial material absorbs the characteristic of blade it is known as every koto alc is glass feeling by polish bad quality reviewer, I don't call his name.
like 95 grams of Viscaria can play similiar to 95 grams TB ALC but you will get 95 grams (not Golden version of Viscaria) I doubt it.
Viscaria is around 80-86 but you can find 90 grams too.
TB ALC 85-90 grams
ZJK ALC 3 badges around 88-90 grams that's why if I can compare 90 grams of TB ALC,
I will put in SPEED test TBALC=>VIS>>ZJKALC
84 grams of LGY ALC for me was softer and faster than 90 grams of any koto alc but of course it is opinion, you can get your opinion and buy 4 blades with the same weight in butterfly store and I will listen your opinion