Tough Pick, but since IDK which one Kyogre is going to be in Ill have to go with SoulSilver. Not because SS has Lugia, not because its Silver, but because in the original Ho-Oh was Lvl 70 and Lugia was Lvl 40. Case in Point: Stronger Ho-Oh.
Kyogre is in HG, and you could EV train a lvl 40 Ho-Oh to be even stronger.