Fraternal twins are much more common than identical twins, because most IVF clinics will implant two embryos at a time, due to the chances of implantation failure.
(Also, for non-IVF, fraternal twins are also much more common, for different reasons.)
FWIW when my wife and I went through the IVF process our provider (RMA, who are basically a large US-wide franchise) informed us that multiple embryo transfer was not an option offered by their clinic (not that we would have chosen it, but point is it wasn’t presented as a choice).
(Also, for non-IVF, fraternal twins are also much more common, for different reasons.)