Well, I'll just throw myself into the bonfire here, as I am one of those annoying players. I came in playing MW2 at my lunch breaks in highschool at a local electronics shop and they had MW2 loaded up on their computers. Ironicly, it was the Stormcrow that I played first, but I quickly did come to enjoy the Timberwolf.
That being said, the first Battletech game I owned/played was Mechwarrior 2: Mercenaries (IMHO, A superior game to MW2 in every way). It was then I started understanding the lore, and really started to understand how much of a jump Clan tech was from IS, especially once i started playing on Merc net and realized everyone was using clan mechs not due to any real personal bias, but because it was just more practical. Ironicly, once understanding the game, the Timberwolf became a bad choice over-all once you figured out how the hit-boxes worked, and how the legs were a really large hitbox.
Though I've grown up and expanded my understanding of the game and the hundreds of mechs and varients, it's put me at odds with myself in my favoured mechs, and appreciation for each of them.
That being said, I voted Warhammer. I just like the design of it visually better than the Timberwolf, I like that it's better able to provide fire support consistantly where the Timberwolf can only do it for a little while before it runs out of ammo, and the Timberwolf suffers in the MW games because of the placement of it's cockpit, where shooting it in center of mass is pretty much hitting the cockpit, while the Warhammer you need to aim high and when you miss, you're shot isnt guarenteed to drift onto CT as it would the Timberwolf.
Also, Warhammer has SRMs, which in TT was great for finding ways to cause crits while the Timberwolf isnt as effeciant trying to do the same.
I know I keep jumping between TT and MW for comparison, but I think in both cases I like the Warhammer (Particularly IIC) over Timberwolf (Prime config)