Selecting a probiotic depends on the actual bacteria you have
Different people with the same diagnosis will have often very different bacteria mixtures. Asking for the best "IBS" or "CFS" probiotics on groups often results in a waste of money and sometimes worst symptoms.
When you click suggestions, the middle of the suggestion page will show something like below. Click on a probiotic for more information.
As always, the choices should be reviewed for risk with your medical profile by a knowledgable medical professional before starting. Some Lactobacillus have resulted in death.