My feeling about these two games:
MW:LL will hit the deck much MUCH harder, because we (the fans/enthusiasts) like the idea of people working hard and having vision... a vision most companies would go broke when trying to uphold it in this detail^^^
furthermore it is most satisfying to see a "personal creation" being strong enough to withstand a company-produced retail product which will be the case when comparing MW:LL to MW(5)
I bet that MW:LL will have the bigger base and more prosperous community than the new MW product...simply because of the love and dedication put into the mod.....
which I appreciate most ( do you all appreciate godlike works as MW:LL as I do?^^)
and hell: if i was crytek seeing this modderteam working the hell out of my game, I´d personally give them some hefty supports to krank it up a notch more or so

and I know crytek is already impressed^^
I will support MW:LL first and foremost because its ART not a PRODUCT! (sure, sure, specifically seen its a product as well, but noncommercial

, small but important distinction to me )
<3 to the devs