Best=most perfect compromise of: practicality, reliability, simplicity, economy, efficiency, and most important...what I like best.
There is nothing more simple to troubleshoot than a filament lightbulb. No moving parts. No circuit board. No capacitors or semi conductors or anything. Just a filament in a vacuum. AMAZING!
They certainly have a large installed base...
reliability,
A "good" tungsten lamp lasts thousands of hours, any old LED lasts a hundred times longer. LEDs don't quit when you drop them, and they don't scatter broken glass.
simplicity,
The principles of operation are easy enough to understand.
economy,
As in low cost to buy? On a per unit basis, true, but it takes scores of tungsten light bulbs to provide light for as many years as a single LED lamp.
efficiency,
Only a small fraction of the energy that goes into a light bulb comes out as light, most of it comes out as heat.
and most important...what I like best.
No argument there!
You missed one, Tungsten lamps simply put out more light than an LED lamp. That's a big sales point.
There is nothing more simple to troubleshoot than a filament lightbulb. No moving parts. No circuit board. No capacitors or semi conductors or anything. Just a filament in a vacuum. AMAZING!
I'm not quite sure what good it does you know the filament is burned out. It's not like you can repair a light bulb!