palatine
To be fair, I'm on a video game side of things, but I can speak tons about how awesome MechCommander games were and how badass the Cougar felt in MechWarrior 3. And how big of a letdown MechWarrior 4 was. MW4 broke my roll so hard I still haven't got to play myself another BattleTech video game all those years later - it was a disaster of a video game.
Aside from that - I've read a number of pages of lore. And yeah, once again, 5Y Anubis is totally awesome. Sweet combination of angular design and a fixed head that doesn't cross the rocket ports when it turns. Aside from Anubis - well, Mad Cat, of course. And Urbanmech. I love that can of whoop-ass. Though, I, in general, like weird mechs. The three-legged or four-legged ones, all that stuff. Or, like ICU mechs. I can imagine them pumping out clouds of smoke akin to Warhammer Knights. Shame all that stuff doesn't get much show because reasons.