ATTACK STYLE
Most beybladers who focus on attack style beyblading use fast powerful attack beyblades and concentrate on getting the match over quick, relying little on heavy endurance. So if the blade they are going up against is faster or is defending and isn't in their line of fire the attack blade will lose spead before making it's initial attack. Adding weight to give the blade endurance might help but keep in mind the principles of attack and you should do better.
DEFENSE STYLE
Defense style bladers go for endurance half and obviously defense the other. They normally use a blade built for a long spin that is heavy and one with parts to fend off attacking blades. But if your blade is too light or has too much resistence in its attack ring then you could have a problem. Using parts that make the blade rebound or ramp opponents off can fix this. Also using a heavy or balance weight disk like a ten or eight balance should help.
ENDURANCE STYLE
The name kinda speaks for itself. This type of blader focuses on having more energy than the opponent and using it to out spin the other blade. The blades normally used by this type of blader have few risiting, striking areas and are heavy with a round, pointed and usually metal base tip so that they dont waste enrgy moving around. The problem primarily associated with these blades is that they never move or move too much. The heavier the blade the longer it wil spin and the less it will move adding weight that is centered will make it stand more still. If it doesn't move enough then you use a wider weight disk. Always keep it heavy and try to remove most striking surfaces so that it basically just rolls off enemy blades.
COMBONATION BLADER
These type of bladers can be the toughest to bring down if they know what they are doing because they can combine two of the above attributes to make an awesome style. But if you are not careful you can leave holes or flaws in your style that can easily be broken through by the weakest of bladers so if you are in this category be careful and do what you do best in each category you combine.