they are equal at this point, from a profit point of view, altcoin are not so much more profitable than mining bitcoin directly anymore, it still about having cheap electricity
and with altcoin you don't need almost 5 tera to have a decent income
thats the key, the cheap electricity so if you are able to minning with cheap electricity you are like a privileged.
about if you should mine btc or ltc is up to you but i think if i was you with cheap/free electricity i will go for btc