I worked years ago at a company designing teak outdoor furniture, teak is extremely expensive unless you are buying tractor trailer loads. White oak holds up extremely well, I have had good luck with sapele outdoors too.

The Adirondacks pictured are white oak the lighter ones and sapele. the other furniture is sapele for the back patio of our library. No finish is needed on these woods I did coat the Adirondacks with sikkens