I Love Waffles
And Waffle Makers are interesting appliances,
However I think you will find little difference in overall performance of different WMs, it is sort of like baking a cake you can only bake it so fast.
I have been using cooking spray on our 1960s Sears Kenmore waffle maker for well over 25 years and it works great and the grids are not the least bit gummed up or sticky, the waffles taste better if not soaked in fat and have less calories so you can eat more.
John L.