several different antibiotics in different classes are used to treat peptic ulcers caused by h. pylori. the "best" one is the one that works for you. your health care provider will prescribe an antibiotic for you based on your complete medical history any medication allergies you have and so on. it's not possible to state unequivocally in a forum like this which antibiotic should be used to treat h. pylori because so many factors going into the process of choosing a particular medication. sorry i can't be more specific but i wish you all the best!
what is the best antibiotic regimen for the treatment of helicobacter pylori infection