Part of me wants to say Marik, but the Cappies' tools are too good. They have:
-Anubis: Practically invincible at long range, it can generate +5 TMM stealth-walking, which puts everything except the TC-equipped Ninja-to and the LB-X 'Mechs at 13 to hit... and fire its ERLL heat neutral on top of that.
-Sha Yu: Had it been the -2b, this would be even more broken; but the -4b is kinda wasted in this lance, since it's a pretty good C3 spotter, supported by... a lack of C3 in the lance. Either way, SYU is just as invincible as Anubis, but can only "snipe" with an LRM-5 (and not one or two ERLLs as found on the -2b.) Once it furballs, SYU accounts for itself rather well.
-Cataphract: This means that enemies have to rush and brawl. The CTF kinda likes that, with its reach weapons being LB-10x and plasmaaaa. Up close isn't where anything wants to be with it either, since it's a heat-neutral alpha, adding two ERML and two MPL to its big guns. Also, MASC.
-Yu Huang: Similar to the CTF, only it has double plasmaaaa and also runs double MML-5, backed up by two ML and one MPL. No MASC but can jump.
Davion has two RAC-dominant 'Mechs, which is risky; Kurita has the terribad Wolf Trap, along with two C3 Slave units and no Masters. While the Akuma isn't bad otherwise, the Ninja-to only has two Snubs on a TC.