It really depends on the instructor.
The main thing to consider is that a recreational rescue class should spend at least as much, if not more, time on PREVENTING accidents.
A recreational rescue class will also NOT prepare you to do much in water unless you practice the skills regularly. There are thousands of "Rescue Divers" who haven't practiced one single thing since the class. But they puff their chest out and say "I'm a Rescue Diver" in an effort to impress those who don't know any better. I've met a few of them. I wouldn't get in a wading pool with them.
Some of the in-water stuff you will do in the class is not very realistic in an actual emergency.
The missing diver scenario - recreational rescue divers will only be used in the water as a last resort and more than likely as snorkelers on the surface. If that.
You will not be prepared to do a proper search, and frankly, many professionals (DMs and Instructors) are not qualified to do it.
Actual Public Safety Divers will be called in, because the truth is, more often than not, a missing diver is going to be found on the surface or RECOVERED on the bottom. It's not a rescue scenario, it's a body recovery.
Rescue Tow- Trying to give rescue breaths to a stricken diver on the surface in the water, has maybe .01% chance of even delivering an effective breath by a recreational rescue diver. Once the adrenalin kicks in and you have people possibly shouting, screaming, and crying what will happen is:
1. You'll cut the airway off trying to get high enough to get a breath in,
2. Turn the head so airway is cut off,
3. Push the victims head underwater allowing more water into their mouth/nose,
4. Ensure brain damage/death because you delayed getting them to a hard surface where compressions can be done, O2 applied, and an AED used.
In reality, the best thing is to get them to a hard surface, boat, or shore as fast as possible rather than jerking around trying to give them breaths. Unless you have practiced this enough to 100% guarantee you can be effective. Slightest doubt? Don't waste the time.
Tired Diver Tow? Not a problem. But be prepared in case they go into full blown panic. If that happens you make sure their weights are gone and BC inflated. Then push them off and wait until they tire themselves out and resume the tow.
I always taught my students that Rescue should be the FIRST class you take after open water. Any open-water diver can be trained to recognize stress, problems with equipment, poor dive planning and preparation, and see that conditions are not suitable. The YMCA and later SEI required an OW cert and 10 dives to take the SLAM/DRAM (SEI) Rescue class which was one of the first recreational Rescue classes.
Why? Because of the things I just said. There is no need to make divers wait to make them safer.
UW Nav is a great class! I wrote my own that exceeds the standards of any organization. But UW Nav practice is NOT necessary for a recreational rescue diver. It is for PSD Divers who would be doing the actual navigating underwater. The recreational guy will be on the surface looking for bubbles.
Agency doesn't matter. Find an instructor that focuses on preventing accidents.