Spec or Speed Bearings

General Yo-Yo
1

I just wanna know what is the difference between the Spec bearing and the Speed Bearing.
Also what do u prefer Spec or Speed Bearings??

2

i am sure that they are mostly the same
only spec is yyf and speed is yyj

3

So what should i buy spec or speed

4

personaly i like spec better but thats just imo

5

speed it is cheaper ;D