In every BattleTech game ive ever played, and ive played most of them, even when the game mechanics were against my inclusion of said mechs in the current mission - i always brought one along fitted with the best loadout i could give it. Even when it made the game very difficult due to lacking armour/weapons/speed etc etc.
I would always load my mechs with almost all long range weapons as i never liked getting hit. If i wasnt 100% i was not happy.

MW4: Mercs i played mostly the Vulture even when i was facing mechs vastly more powerful.
MW4: Vengeance i played Mad Cat and iirc Mad Cat Mk 2.
What has been your favourite Mechs throughout the MechWarrior and MechCommander games?