I think the choice of 5er or TT is truly a personal decision. There is enough support, even on these forums, that both tow equally as well, as long as they are equally hitched with the right hitch system (for both).
The selection of a TT or 5er is based on personal usage and need. The biggest disadvantage of a 5er are steps. The biggest disadvantage of a TT is overall length for the same size of trailer as a 5er.
After that, everything else is splitting hairs about where each person's comfort zone ends.
When selecting a TT or 5er, not only do you have to consider the length of each trailer, but also the height, and of course, your own comfort level towing. A successful tow, still ... all depends upon the proper tow vehicle.
We each select the type of RV we choose, because the advantages of that type of RV outweigh the advantages of a different type. For example, Motor Homes are all complete. No need for hitching and unhitching. But a TT or 5er allows the camper to separate from the tow vehicle, providing freedom to tour areas that are restrictive if you have the full rig.
What you have to do, and only YOU can do it, is determine what type of camping you want to do, what are you really looking for in a trailer, and what floor plan works for you. My choice is just that, my choice. We no longer have young children traveling with us. I need my pick-up for more than just towing a trailer. And I have more than plenty of space at home to store the camper when not in use. I'm getting older and just had a total knee replacement, so the fewer steps I have to deal with, all the better. I don't want a high profile trailer with a lot of wind resistance on the front cap when traveling. I wanted something comfortable for 2 adults only. Something that would run on 30 amps, so I'll never have to struggle with a 50 amp RV and having only 30 amps available in campgrounds. I selected the right tow vehicle, the right weight distribution hitch system, and have never had a problem towing anywhere yet. Yes, I am long, and I've not had problems getting into fuel stations. I choose wisely and plan my entrance and exit routes upon first sight, and sometimes, will select a different fuel station because the situation looks like it jut can't handle 59 1/2 feet of train attempting to squeeze between the pumps.
Taking all these things into account, only YOU can determine what will work for YOU. I highly suggest you visit several RV dealerships, RV shows and . rallies. Ask yourself what your intended purpose is for owning an RV, what kind of camping will you primarily do (dry, full hook-ups, State Parks, RV resorts?), and who will be traveling with you. They should have input also if they are living with you full time.
The only person you need to satisfy, is yourself. We can give opinions, thoughts, suggestions, warnings, our successes and our failures, but in the end, it's really what YOU want.