Diminished ovarian reserve with low egg supply. Would u rec Clomid (clomiphene) with IUI or injectable with iui. I am 35 years old?

Yes, IVF is better. At age 39 with DOR, you may try few cycles Clomid (clomiphene) IUI, but IVF is a better option. The reason is with DOR, you don't have many embryos to work with. On the other hand, if you do IVF, you may bank embryos and do FET later. At age 39, I strongly recommend to do Pre-implantation genetic screening (PGS) of your embryos prior to transfer. It will increase your change of pregnancy and reduce miscarriage.
Diminished reserve. With diminshed ovarian reserve gonadotropin/iui is more likely to be succesful. Alot can depend on your specifics, though.