I've had a bunch. Current F150 has Extang solid 3 panel folding "Trifecta". About $500. I've had solid fiberglass, I've had roll-up soft tonneau that velcro'd to plastic rails. Most lock in one way or another from the inside and your locking tailgate secures it all. There are pros and cons to each. I probably liked my solid fiberglass covers the best. Leer brand a couple of times, ARE, and a Jason. Not cheap, and then you have to add in for paint. Which might be another cost if you trade for a new truck in a different color. Biggest complaints about solid fiberglass is its a chore to remove, especially by yourself, and sometimes the glare coming off of it looking out the rear view mirror. They especially can be aggravating if you find yourself needing to load something tall unexpectedly.
The type I wouldn't personally recommend is the soft ones or hard accordion style that retract into a small box up front. Retrax is the largest peddler of these. If you have a supercrew with an already short bed, these just take up too much room at the front of the bed. And they can be super pricey. Some require drain holes to be drilled into the bed itself. And I've seen more than one with hail holes punched right thru it. Noticed you are in Texas, so that should be considered. From F150 forums a lot of snow-belt state truck owners have thoughts related to snow load.
Solid fiberglass, in my experience, kept the inside bone dry. My new solid 3 panel will let in just a little water, but not much. There isn't one out there that isn't theft-proof, so just be mindful of what you keep in it and where.
You didn't mention but don't look for any real fuel savings. And resale value can be terrible. The used market has a bunch of bargains if it helps.
