Femara vs clomid, go

Adry • 29 with PCOS, married, TTC for 2yrs 6 clomid cycles and 8 letrozole, chemical pregnancy loss September 2019 trying again with IVF first FET ended In miscarriage in September 2020 and now waiting to start FET 2 🌈👼🏻

Anyone try both and have success with one more than the other? I have PCOS and one closed tube and already done 4 failed rounds of clomid. Should I switch to femara before I consider IUI or IVF?