My main reason for prefer litecoin (or a faster coin) over bitcoin is simply the confirmation time. When I have to wait over an hour after a transaction is initiated in order to use that amount, it's simply impractical and completely unnecessary. litecoin takes much less time. (though something like worldcoin would be more ideal)

Also, ASIC's will ruin bitcoin mining and all the GPU miners will switch to scrypt coins. I'm not sure that detracts or adds to litecoin's overall value, but it certainly will keep more people interested.