Searching the web has some answers:
The article would make you never leave your home again in the Express but then
they counter it with this article.
National Geographic have diagrams of how a virus could spread and saying a window seat is better, as per the previous article.
The BBC takes it's usual well balanced approach here.
Like everything you do there is an element of risk. Variables will change depending on time of day, where the plane has just come from, who's on the flight, who stood near you in the terminal, what you touched and did you touch your face. So, picking a seat is just one element to consider. Personally I would wipe down the area around me, bag the wipes safely, sanitise my hands and keep them away from my masked face. If everyone is wearing masks, then that will hopefully reduce the risk of airborne droplets that carry the most risk. Every seat has pluses and minuses to it. I would go for the last seat with no one behind me, but that means passing through more of the cabin and touching something may be contaminated.