What are the reasons to use an LDR or a semiconductor light sensor ?
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Sorry, my post wasn’t specific enough.
I put it up initial to help beginners decide what they need,
Thanks for catching my internal voice
The article doesn't actually mention phototransistors, unless I missed it.
Is it accurate to describe photodiodes as "unidirectional resistors"? Most of the photodiode circuits I have seen rely on the photodiode's ability to generate a voltage when light falls onto them, which is very small and usually an Op-Amp or analog comparator is used to get a signal suitable for an Arduino input.
For example wavelength and speed...
Most of phototransistors have peak at near infrared, while photoresistors at 550nm. So depends what you want to measure, daylight or some specific wavelength.
When I had to detect light from a project I was doing about detecting the glow from various glow in the dark materials I used one of these:-
Adafruit TSL2591 breakout board
Good choice! But comparing that to photoresistor is like comparing shoes to horse.. 
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