LTC does faster and cheaper
because faster comes at a cost: much bigger blockchain and more risk of orphan rate which means requiring more confirmation and longer wait.
and cheaper simply means so little are using it that their blocks are empty.
but allows GPU mining
there is nothing called ASIC resistance, it is just a word that is used to advertise the altcoin. when they say it is ASIC resistance most of the times it means nobody has bothered YET to create an ASIC for mining that coin.
in case of LTC they bothered to create it and it now exists. there are antminer ASICs for it and GPU mining is dead.