Difference: NeoGeo Emulation <=> PSX-Port ?

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I've got "Marvel vs Capcom Clash of the Superheroes" (418MB) and Street Fighter Alpha 3 (514MB) both as isos for pcsxbox.
But i've got them both as NeoGeo roms as well: mvsc.zip (22MB); sfa3.zip (22B)

Is there any reason I should keep the bigger PSX isos instead the small NeoGeo roms?


Same goes for Metal Slug, i have Metal Slug 1-5 as NeoGeo roms (~30-80MB) but Metal Slug 3,4,5 also as XBOX-original games (~350MB), where's the difference?
 
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