By all means have a good discussion on the video topic – it is certainly one of the more contentious issues when playing retro games! :)
Just a polite reminder to keep the discussion on topic, and allow each other to hold a different view.
Otherwise we’ll have to open a religion and politics forum! :)
Anyway, back to the topic. My main Pi TV is a 720p screen and I have always quite like the look of shaders, not least because they are very easy to setup! And also because anything to soften the harsh treatment the upscale and LCD screen give the image is a good thing.
I’m tempted to try the overlay approach though as the results do look very good indeed.