I think you want to know the upgrade between each generation. Let me start some first please help complete/correct it together la!!
TB01 EVO. Base on the design of TB01. Replace the plastic tube with graphic chassis. Full bearing and metal shock absorber. Nothing special but it was a good car.
TB01 EVO II. Full bearing of course. Suspension part is upgraded. Different lower arm and upper arm. Metal suspension arm mounts are adopted. Bottom and top chassis sharp is also narrowed and changed. The largest change is the gear box. It composes of 2 metal bulk heads to hold the plastic gear box
TB01 EVO III. Totally different from EVO I and EVO II. A newly design car based on TB EVO 2.5. Nothing shares with the previous generations. Highly narrowed chassis which move the weight as close to the centre line as possible. Newly design suspension arm mount. The whole set of suspension part from 414 is adopted. Flourine coated shock absorber. Newly designed gear set and connected by the most direct and the lightest one piece propeller shaft.
TB01 EVO IV. Still has great change from TB EVO III. Has front and rear metal gear box. Newly design propeller shaft which divided in to 3 (TB EVO III using one piece propeller shaft). Adopts light weight reversable arm kit. Different internal gear ratio. Others: high-end standard.
TB01 EVO V. The latest generation. Ultra low CG design. Top open style metal gear box. CVD type propeller shaft. Others high-end standard
Thats all I know!
Which one is the best??
Highest grade
EVO V. It solves the biggest problem in this series, the front one way gear strip. Has the lowest CG which help providing better body movement. Easy maintence.
The most innovative
EVO III. It still is the one which has the lightest and simplest shaft drive structure.