Best F-5 upgrades out there

In terms of improved capabilities, which is the best upgrade being offered for the F-5 series?

so far I’ve seen the

Tiger III (Singapore)
F-5 2000 (Turkey)
Brazils F-5

being some of the more advance.. Singapore is armed with the Grifo and supposedly has provisions for AMRAAM but a lack of one nose cannon.

The Turkish F-5 2000 went to Israel for an upgrade with some Singaporean upgrades as well but it’s unclear to what kind of new radar (if any) was installed and what kind of weapons.

no idea on the Brazilian one