Swing,
When someone is throwing 90-95 mph moving fastballs - or mid 80's sliders at you - or even good changes - you are going to be fooled alot IMO.
If you dont have strong hands/wrists/arms - and good hand/eye coordination - you are in big trouble.
The only exception - unfortunately - is if you are swinging a $300 aluminum rocket launcher. If that is the case - you can be weak - be fooled and still get the ball out of the infield.
BTW - Happy New Year.