Are there any situations where you would choose a red dot over a scope?
Here is my humble opinion (I have used both, for many years)
Yes there re cases where each has its advantages, also you need to pay attention to the dot size in MOA and scope power.
The dot is really good if you want to make fast shots. Not as fast as irons but the fast shot with dot is more precise. The dot gives you a larger sight picture than a scope but depending on the size and distance to the target, the dot may cover the entire target, especially if the intensity is turned up. Be careful because most places stock 3 to 5 MOA dots. At higher intensities (ie. sunny days ) the dot size is considerably larger so you might want to look for a 1 MOA. For a large target like a large or medium size animal at a close distance (50-100 yards), the dot would be fine, but for smaller targets(like paper bulls eye) you might have a problem even with 1 MOA.
For a stationary or slow moving target, go with the scope. They are expensive but if you get a good bright zoom scope with a low end setting for magnification, you are getting some of the advantages of a dot and all of the advantages of a scope but given the smaller outline of the dot, the dot will be still faster.
Some variable magnification scopes come with a dot mounted on them - for the speed.
Also if you are expecting to be in the rain - forget the dot. When it gets wet, all you will see are dots everywhere- worst than iron with failing vision.
Don't forget the battery factor. The dots need a battery to run unless you get a trijicon or Meprolight that is tritium and sunlight lit- These cost quite a bit and are roughly the size of a small scope.
Suggestion,
Get a cheap dot if you can mount it on the gun. They go for as low as $40. Try it and see if you like it. It likely wont last very long before something breaks but at least you can see what it is like.
A lot of this is personal preference - they both take getting used to if you have only used irons. Once you get used to it, its is hard to go back.. For me I use both, depending on what I am using it for.
One last option not mentioned yet is a high visibility sight - I use thesetoo for some things where rules do not allow optics. The best one I have found is made by advantage tactical out of arizona. I tried many different sight types (at least 5) ranging from ghost ring style to ones that magnify the irons but not the sight picture. The advantage tactical were the best. h ttps://advantagetactical.com i have them on 4 of my guns. They ship to canada also.
For what it's worth.