Hi Chad
Probably 6 of one, half dozen of the other. If the market goes up after you invest, front-loading was better. If it goes down, it wasn't. In 20 years, probably doesn't matter at all.
VTI and VXUS are good to have as core asset allocation.
As an aside, I personally wouldn't do cash-out refinancing to invest - leverage multiplies gains and losses. It's nice when it works, painful when it doesn't.