You can allocate 50% each, which is actually very simple, so you won't miss any of them.
Hmm I can say that these two coins are such good coins but I would rather choose Ethereum over EOS, because I know that Ethereum has so many contributions in this crypto world more than EOS. (Don't get too offended, pls.) I choose ethereum because I know it is one of the top altcoins of all time and I'm sure that it will go on higher.