My recently purchased Glock 43 is going to be rocking some Ameriglo UC Tritium sights, specifically the GL-352
with green front sight and rear all black u-notch.
I am a fan of green front sights on pistols over red, they catch my eye a lot better (and faster), they also contrast against objects during daylight. The rear all black u-notch make it pretty easy to dial these in for precision.