If you are good at creating things from scratch, you can create your own styles if you have a high-end arranger. For the type of music, an arranger would not have the number of sounds that you would require; unless you get an arranger that can create and read samples.

One of the advantages of using software synths is that you don't have to run out and get another keyboard if you get tired of the sounds. You can just get more sounds to add to what you have. And you can get sounds that are specific to the music you are doing. You don’t have to get sounds that you don’t want nor need as is the case with arrangers and hardware workstations.