I know that the methanol boiling point is lower than ethanol and the degree of volatilization as well. Are there any other reasons for this if you want to use GC-MS analysis
It really depends on what you are extracting. The solvent is more important for the extraction than for the GCMS. GCMS is compatible with lots of solvents, but your molecule you are extracting might not be.
I agree with Valerie. The selection of the solvent is very important in an extraction process, where you must know of course the substance you want to extract. It is vital to know the level of solubility of the solvent in the interest substance. In addition, it must sometimes take carefull with the toxicity level of the solvent.
Yes, like others mentioned, it depends on the affinity of compounds that you extract. It also it depends on the conditions of extraction. For example, applying ultrasounds may affect extraction efficiency.