Take a tank sitting 400 feet from the nearest panel. All you want is its level on a screen. Simple, right?
The wired way: trench or overhead run, conduit, pull cable, terminate both ends, a junction box or two along the way. The level transmitter is the cheap part. The labor - and the shutdown to tie it all in - is where it stings. A week of an electrician's time isn't unusual.
The wireless way: a battery-powered radio on the transmitter (or one with the radio built in), a gateway near the panel, and an afternoon of setup. No panel or network out there at all? A cellular gateway sends the reading out over a data plan. Done and dusted.
For that tank, wireless wins, easily. Same goes for most jobs that look like it: well sites, lift stations, that pump way across the parking lot, anything on a rotating or moving machine where a cable would chew itself up. It's also great for snooping around. Stick a temperature or vibration sensor on a motor for a month, see what it tells you, move it to the next one.
Which radio comes down mostly to distance and how much data you need. Inside a plant, WirelessHART, ISA100, or one of the sensor makers' industrial radio systems will get it done, and the mesh flavors route around obstacles on their own. Across a big site with small, every-so-often readings, LoRaWAN goes a long way on very little power. No network at all...cellular.
Now flip the tank example. Say that level reading drives a pump that has to shut off before the tank overflows. I'd run wire for that, no hesitation. Wireless readings show up every few seconds or minutes, not milliseconds, and a radio link can drop out when a delivery truck parks in the wrong spot. Monitoring? Great fit. Control loops and anything safety-related stay wired, unless you're using a system specifically certified for wireless safety, and that's specialist territory.
Wired isn't automatically bulletproof either, by the way. I once spent way too long in 115-degree heat chasing intermittent dropouts on a camera network, double-checking code and pinging everything in sight, before my feeble brain finally checked the field-made Ethernet cables. Swapped one for a store-bought cable and voila. Check the simple stuff first.
A few things trip folks up the first time around. Batteries last a whole lot longer when a sensor reports once a minute instead of once a second, so figure out what update rate you really need before picking a device. Steel, concrete, tanks...even water...soak up signal, so walk the site with a test radio before you buy twenty of 'em. Hazardous area? Wireless devices need the same certifications wired ones do. And please, pretty please, don't put a PLC on a public cellular IP address. Use a VPN, or a gateway that only pushes data out.
I'd start with three or four points and let 'em ride for a month. You'll learn how signal and batteries behave at your site way faster than from any datasheet.