A local dealer will generally do a better job.
The problem is that corporate installers or contractors will likely never go back to your house again.
Therefore a corporate installer may do things to save time and to get the system installer, where as a retailer will likely do it 100% right the first time so they are not getting called back on a service call.
Example would be a retailer would take the time to run all new wires and clean up the mess left by the 3 previous providers you had.
A contractor would just install and not be concerned with the overall look of the finished product.
Many times If the customer had Dish for example, I’ll take the old Dish down and clean everything up.
A contractor will put up a new dish and leave everything else in place.
It’s not necessary to leave other non functioning antennas in place if they are not being used. If you switched back, you would get a new Dish anyways.