Hey Robert, welcome!
Did you already own the Bronco? Or did you buy it more recently with the intent of selling it on?
Either way, stock is what I say. It's not the "bumper" that is popular these days. There's no consensus in that department. And not likely to be anytime soon since most new owners are not buying these rigs to go off roading in anymore. Strictly street rigs in most cases.
It's the overall Bronco that sells. Plenty of examples of stock, or near-stock EB's selling for way more than highly built ones. So unless you're building on spec, or have a known audience that has money and likes to buy rigs from you, I would save money on the fancy stuff and stick with stock. Go for rust repair, drivetrain reliability, and stuff like that.
You likely won't get back the money you spend on the aftermarket bumper, especially if you put a winch on it.
Don't bedliner the interior unless you take copious photos of the sheet metal first, to prove to a prospective buyer that you're not just covering up swiss cheese floors.
Good paint and body goes a long way in selling Broncos these days.
For a winch type bumper, you're probably looking at spending between $700 and $1000 bucks or so. Plus shipping if you're not near a vendor.
For a non-winch type HD bumper, more like $300 to $600 or so.
For a stock bumper it's $100 to $140, assuming you even need new ones. Do you have to buy bumpers no matter what? Or are yours in decent shape?
If you're building just a nice Bronco to sell, and expect to make money on it, then spend as little as possible.
If you're building a nice custom off-road rig that actually calls out for a winch-type bumper, go for it. But by the time you're building that much of a custom you're not looking at making much money anyway. At least not on the normal market I think.
Unless you happen to be really good at building Broncos that is. And the Bronco ends up being really special.
You're starting with a pretty popular year, so that's good. Not sure that a half-cab is more popular than a full-cab in the resale market. But if you were missing a top completely, or already had the short top, then it certainly makes sense.
Good luck.
Paul