You didn't mention the year of your CRV but if it's 2015 or newer the question is moot. You can't tow it 4 down. Now if it's 2014 or older you are in luck as it's probably one of the most common cars that folks tow 4 down behind an RV.
As someone who has done both 4 down is not only easier, it's exponentially easier. We had a dolly with our civic because I had no choice. HUGE pain. Not only is it a pain to load the car it was almost impossible not to mention dirty to load when it was wet. I once cracked a piece of the Civic's lower body work when it slide sideways trying to load in the snow. After a few miles you have to stop to tighten the straps, you have to find a place to store it, some CG's won't let you store it on site, it can be heavy to move around, it's another set of wheels and hubs you have to maintain etc. Most folks that use dollys say it's not that big of a hassle and I say they are kidding themselves as it's usually the only option. Sure they have their merits but in no way does it compare to the ease of towing 4 down. If all cars could be towed 4 down dolly's would cease to exist. We tow our CRV 4 down, we use a ready brute elite tow bars with the integrated surge brake. I installed the blue ox base plates myself but I am fairly handy and have a lot of tools. Took about 4 hours - taking my time.
Hooking up is sooooo simple and quick. Per the CRV manual you have to let the car idle for 3 minutes and I am usually hooked up and waiting on that 3 minutes to expire with a minute to spare. 2 cables, one wire and 2 pins - done. I could probably do it in less than a minute. I will never go back to a dolly if I didn't have to. I'd actually probably stop towing and rent a car.