I guess you talk about the 16" sets. The first set has a TAD more range and gets better shell groupings earlier. If I'm not mistaken, the second set does better damage against bigger BBs.

I always thought thet the seconds set had better spread.

Anyway.

Regular - Lighter, more range (barely noticable).
Type 90 - Heavier when loaded with shells (the shells are ultra heavy for a BB3 gun) great armor penetration that lets them pierce QV armour. More damage due to very heavy shells (even tho they have less HE damage).

In fact type 90 can oneshot some BB5s

http://www.youtube.com/watch?v=VTiStq6LRts

so it means the heavier shells weight is more damage..
what you really suggest guys, type3 have (1100 shell damage) or (type 90 880 shell damage)?

Hi this is a better example between the 2 guns:

http://www.youtube.com/watch?v=9rbBRc-BrRI