I have had a couple dozen pickups over the last 35 years, and only a couple, as well as my new one, had toppers on them. The main reason for the toppers is for work though, as I never carry enough personal gear to warrant one, or even a pickup for that matter.
Most of the toppers I have had or seen are not all that theft proof. If someone wants in, they will get in. Even my current work truck (Ford F-350) topper, a full body aluminum insert type, so really not a topper, made out of heavy duty aluminum, was stolen and had the heavy metal hinges cut off with a metal blade in a recip saw, with the thieves getting away with about $15k work of tools.
Here is a shot of it with a Trillium
1300 behind it for comparison. It holds a lot of stuff well organized. It is not light
at all though, having heavy aluminum on all six sides.
With my new truck, a Ford F-150, bought with towing my upcoming Escape
5.0TA in mind, I obviously will not be able to use a topper of any type. So off to search and research tonneau covers I went. I spent many hours looking for just the right one. I will likely sell my big truck, as well as my big dumping construction trailer, and use this truck for work, in order to get some cash flow happening.
I looked at all the tonneau covers available. Lots of really good options, that offer every bit of security that a topper does, however, I was keen to have one with a built in toolbox, for use as much when towing, as for work. I finally ended up ordering a Fold-a-Cover G4 Elite four panel folding tonneau, with their built-in Personal Caddy Toolbox. I did the install myself, which went very good.
This topper is great, I can flip the front panel back to access the tool caddy, or flip the back three on top of the first one, allowing full access to the rest of the bed, and be able to hitch up my 5.0. So far no leaks
at all, and this thing is really tough. I can even walk on it. Once it was set up, if I should ever need use of the full bed, it is only minutes to remove the cover, though leaving the side rails in place.
Here is the link. I am sure some of you have heard of them, but worth checking out.\
Fold-a-Cover Tonneau Covers | A Division of Steffens Automotive
Bottom line, there is no right or wrong to either a topper or tonneau cover in my opinion, there are good and bad in both categories. You just need to find a solution that works for you.