The choice of antibiotics play an important role in correct treatment regimen so i am sure one would fine the details useful .Both the antibiotics have pivotal roles to play in addressing the specifical infections.

1)The following are the Clinical Considerations for Choosing
Choose Amoxiclav –
a)Anaerobic coverage is needed (e.g., dental infections, ENT abscesses, diabetic foot)
b)Gram positive organisms are likely (e.g., strep throat, sinusitis)
c)There’s beta lactamase producing bacteria suspected
d)Pregnant or lactating women need treatment as it’s generally considered safe.
e)Infection involves soft tissue or dental abscess (good anaerobic action)

2) The following are the clinical consideration for Choosing Cefixime :
a) Suspecting Gram negative bacteria, especially in UTIs or typhoid
b)Patient has mild penicillin allergy
c)Compliance is an issue cefixime is once-daily dosing
d)Respiratory tract infections where beta lactamase coverage isn’t critical
e)Alternate option after Amoxiclav failure or resistance

These are general points on which you decide on the right Antibiotic, however one must consult a physician for the treatment.
Regards,
JAKSTAR PHARMA