Well I watched both of these series completly and like them both so I think my opinion is fair. Berserk is alot better.

As far as who would win a fight. I certainly dont hate Kenshin but the winner is easily Gatsu.

For starters, I will discount that Kenshin would use a reverse blade sword and say he is fighting as the Hitokiri. This is because Gatsu is wearing armor for one thing and second off, it wouldnt even work against Gatsu bare naked flesh. Gatsu is way stronger than even Sanosuke and his muscles are 4 times larger and as hard as steel.

Second it is a physical impossibility that Kenshin can block Gatsu Sword. Kenshin only weighs about 100lbs and his sword is very thin. Gatsu's sword probably weighs about 400 lbs and he swings it with 1 arm as though it is a twig. He eaily cuts through 2 or 3 fully armored men and would break Kenshins sword on impact.

Also Gatsu is uber skilled and uber fast. If you read the manga you know Gatsu is probably faster than Kenshin, and at the very least equally fast. When Gatsu swings his sword it creates a much bigger vacuum than even Kenshins ultimate attack. On a last note should Kenshin even manage to stab his blade into Gatsu, he might be suprised to find that instead of dying, a gigantic sword comes down on him at 200MPH from an extremely pissed off Gatsu.

(no point for anyone to argue about the speed, see volume 9 where gatsu fights the "circus fighter" using several whips going at hundreds of miles per hour and evades them easily. Also Roshinu's attacks in the lost children arc literally create a Sonic Boom, that is 340 M/S, and gatsu manages to block and evade them)

heh well anyway this match-up is not even fair (did i mention Gatsu has a cannon?)

oh ya, Gatsu is also a good looking(my sister confirms this) non bi-shounen guy for once. On a slightly related note, Serpico can also whip basically any Kenshin character as well.