Yes, I think, there are bitcoin's alternative, because too much expensive.
I have profit at ETH and TRX, I buy ETH in ICO the first time. And i have cash out of it.
But You must research first before you hold altcoin.
Among the ALT coins you have mentioned, these coins are quite reliable and one can invest in these coins with confidence. But if you want to invest in the above mentioned coins then you will be investing in limited range it is better not to invest extra amount in ALT coins. And I think in addition to investing in Bitcoin we should invest in some potential ALT coins because some reliable and trustworthy ALT coins in the market are capable of going to a good market condition in the future so we should not miss any opportunity.