Both coins are good for investing on because this are the two top coins every investor hodls in there portfolio with guarantee that as long as you have patience even if the price is going down, there is no problem because you will always get your investment and gains back. So which ever you choose is fine.
It is true, both are always good choices in terms of investment, especially for those who are able to take advantage of market conditions which sometimes corrections immediately, obviously the benefits will be very large, although not as much as when there is a large increase.