I rode for a looong time with just a wireless bike computer and it’s fine. I only switched to a Garmin as I was bouncing between road, cross & MTB and mounting a computer on a MTB is a PITA due to the distance from fork stanchion to spoke pick up. So I got a Garmin & just pop it on whatever bike I’m riding.
But for 90% of my riding the Garmin is more info than I want or need. So if you you aren’t big into tracking miles or mapping, a non GPS bike computer is really handy. It can do speed, distance & cadence. If mapping & heart rate are really important than go Garmin but $200 may not be enough for one with mapping.