MPPT controller has a better communication set of commands and you'll notice the ethernet port that can send TX/RX out to a monitor or connect to a network. That's where the general $15-100 charge controller falls off the map - think Horror Freight.

Mind you there are some spectacular Chinese PCB designs / implementations out there for cheap, but off the shelf this is a fairly inexpensive / future proof / expandable unit should more power come off that.

I use something similar and have a wifi module that reports out to a dashboard in the house and can take remote commands from a phone if within bluetooth range.