Thinking about putting my ATV dump cart on the tractor and mowing the grass this week to see how much of an issue it really is.
I think this is a really good idea for you to try, it should give you a good feel for what it would be like mowing your yard while towing a vac.
In my case, towing something while mowing would just not be possible - way too much maneuvering to do and backing - so I have the bagger. It is a bit of a pain to install, very easy to remove. I mostly leave it on, but do have to remove it several times through the season to install the 3 pt or the backhoe. It's gotten to where I can install it in about 15 minutes I would estimate. Takes just a few minutes to remove.
On mine, I've found that I just loosen one bolt slightly on the mounting bracket when I go to install. Do the installation, re-tighten the bolt. That could well be just my issue, as I also have a bit of a fight installing the backhoe pin on that same side when mounting the backhoe. Biggest pain is screwing the top link to lift the bagger up into place, or when lowering back to the ground. Gives the forearms a workout!
There is no doubt it doesn't have near the capacity, so time spent to stop and unload is certainly going to be way more using the bagger over the vacs you are considering. About 4-5 of the acres I mow, I am bagging. It's in sort of 4 "chunks".
I start mowing one chunk, and when nearly full head to my dump site at the far side of the fourth chunk. I mow a strip of that fourth on the way to the dump, empty the bags, then mow a strip of it on the way back to the first chunk. Mow on that first chunk till nearly full, repeat...
That way, I'm always mowing and much less time wasted in the dumping process - just the time to back up, get off and empty the bags, then get going again. By the time I'm done with the other three chunks, most of the fourth is done.
Sorry, no experience with the pull type vacs to share...