From what I've heard from the stat diggers, the Pack howi is better than the LeIg cause it has a much larger AoE, but OKW is less manpower starved than USF so OKW can build more LeIgs and get them sooner.
This is why balancing should never be done using a spreadsheet. When playing the actual game, the LeIG is better. It has less scatter, does more insta-pins, and often snipes snipers. The pack howie is good for damaging more models and probably gets more wipes but neither of them wipe full-health squads very often.
The annoying thing about both of them is that they're not fun to use, but if you don't, the other player will use their cheese and you will lose. The game goes from one broken unit to the next.
OKW player :"I better get two LeIG's before that Brit SOB gets his Centaur out"
UKF player :"Sweet, I got the Centaur out and am going to punish that noob LeIG player!"
OKW player :"Damn, needed to cheese him off the map before the Centaur came out, hope I survive until the Panther."
OKW player :"Sweet, got the Panther out, need to kill the Centaur and win before the damned croc comes out......Damn, croc is out. I'm gardened!"