Hi,
Full sized chisels are the best choice for roughing out carving and removing background. They also work well for details. They are better because you can tap them with a mallet or use your hand pressure. Carve hard maple and you will appreciate a full sized chisel tapped with a mallet. That said, I use palm chisels a lot for carving. In fact, more than full length chisels but that is because my hands were damaged neurologically from severe frostbite three times and I struggle to place the tip of a full length chisel accurately on the wood. I can do it but it takes more time than huddling over a short palm chisel. My hands are very strong so I can push through hard wood with control but I still often have to resort to full length chisels and a mallet.
dave