Additionally, have you flown International Business or First class before? While F is quite an experience a J (Business class) experience isn't anything to laugh at, even if it's BA's lackluster J Seat. Many airlines only operate up to a J cabin as their premium service these days where you get a lot of the premium experience. Premium check-in, sometimes express security/immigration, lounge access and generally attentive service aboard with upgraded food & drink.
With SPG you can transfer the points to number airlines for reward travel. Upside to this is you could get one reward ticket, if available, via the airline program and then use your Avion points to purchase a revenue ticket on the same flight.
https://upgradedpoints.com/spg-starp...rline-Partners