OK, if we are voting here-----this is my choice.
Makita 9005, 5".
I have 2, both yard sale finds and still performing really good after about 10 years of often abuse.
They are really built like a truck, nice balance between weight, power and durability.
One is outfitted with cutting discs and the other is used with wire brush and/or sanding discs.
The trick I find is air blowing clean after every day's usage, that and tightening screws from time to time.
I also like to open the 'gear box' and re-distributing the lubricant as it gets flung about leaving the gear train somewhat dry.
As with everything, maintenance is the key.
If I recall I paid about $25
ea. with leads or plugs damaged.
A very common damage is a pulled inner wire lead in the power cord and folks tend to toss rather than repair.
If not tool repair savy, current shop repair rates leads most folks to replace with new.
Also must add that I like the quality of power line cord Makita uses as well as their generous lengths.
In cold weather the cords do not become fishing rods and I like that length.