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.