With match ammo the biggest concern is QA. Bullets are weighted to the .1 gr, lots of powder and brass are not mixed, and production is done on a much slower pace. Also the bullets used are picked because of shape, how well they fly straight, not how they transfer energy to the target. They only have to make a hole.
Regular loads (if you mean for hunting) are held to a high standard of QA but not as high as match ammo. Bullets and loads are matched for energy transfer. They have to be on target and then take the target down cleanly. Bullet styles and weight are picked based and the animal to be hunted.
Regular loads like FMJ are held to the lowest standard of QA. Loads are picked to be safe, consistent and cost effective to allow you to afford plenty of practice.
Lots of gray areas left untouched in this answer, but it should give you an idea of the reasons and major differences between the different loads you can use.