That's pretty tough to recommend. You'll find bags of predictions and advises here but no guarantee available! But combination is depends on you. Both are potential coin for long term with huge marketcap. but if I were you then I would buy 4 ether & 0.4 btc with some others potential altcoins with rest money. Cause if you analysis the chart of ath, then You'll sell altcoins can multiple your fund faster than btc, although risk is also multiply high than btc also
Perhaps, it was noted already that Bitcoin and ETH have shown impressive market growth when it was finally launched in the market. In fact, only a few numbers of individual who trust this project, how much more this time as the number of investors and adopters keep increasing. It was pretty obvious that these coins will grow more or if may not, we have some assurance that it never die instantly unlike to what happen with shitcoins.
Well, I say to OP that he should have his own stance why choosing them, not just because it was recommended by someone but it should be on what he thinks is right.