Kenshin easily wins over every shura no toki charecter, since they all go cloud watching and explain how they did what they did while he just cuts through them like the sissies they are.
when kenshin fought Aoshi he won over the matrial artist shabng, you'll need someone with super powers to win over him with that field, and the guys in shura no toki only have the power to get on my nerves.

for real meiji era fights i'll choose Kenshin (RK) vs Saito hajime (RK), sure, I know they are from the same anime, but I liked that fight.
for meji era slaughter i'll choose Shishio and the bad guy from PMK against the trio of mobile shinsengumi OVA, it'll be like watching a flaming elphant eating a baby.