I definitely believe long term alts are the better investment here, however, I have seen the "Tsunami Effect" of BTC strong uplegs where all the alt money gets sucked into BTC during the big moves up, only to come raging back into the alts later. Here are my Top alt picks for this week:
https://steemit.com/cryptocurrency/@cryptosphere/top-10-cryptos-of-the-future-july-29-2017-a-weekly-ranking-of-the-best-place-to-put-your-money-in-the-cryptosphere