What’s the best long term holding?

What’s the best ETF or stock to hold long term what I’m thinking is a mixture of SCHG, SCHD, VUG, and DGRO. With that you get some growth and some value/dividend growers. There are other good options but those 4 are good ones I think but what’s your favorite holdings for the long term? $Direxion Daily Semiconductor Bull 3x Shares ETF (SOXL.US)$ $ARK Innovation ETF (ARKK.US)$