Options to refinish deck
I'll tell you what I did with my deck and it worked great... The product name is Copper Green-Brown 

Copper-Green    1 gal. Wood Preservative
https://www.homedepot.com/p/Copper-Green-1-gal-Wood-Preservative-221832/300502828

I just retreat it every 3 years ( no stripping needed ) and it looks fantastic. Very simple solution