Are the NES cores pretty much the same?

I find Fceux crashes a lot when changing roms, but are they all the same optimisation wise?

Nestopia is the most accurate (highest compatibility with commercial games) of the bunch and has official upstream support FCEUmm is a bit faster than Nestopia and has the highest support for unlicensed mappers (mostly Chinese homebrew stuff) QuickNES is the fastest of the bunch, but also has the lowest compatibility bNES is by FAR the slowest of them and still suffers from lower compatibly than FCEUmm/Nestopia

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Thank you for the info. I’ll try nestopia