Infrared grilling can be awesome if you have a proper grill but the panels on the NexGrill are woefully thin. There is no way that the panels will last more than a year. In addition, all of the grooves in the panels look like they would be a nightmare to keep clean.
There are plenty of other styling differences between the grills. The grill grates on the convection grill are cast iron while the ones on the IR grill are steel rods wrapped in stainless steel. The stainless steel wrapped rods look pretty but again, there is no way that they are going to last.
While there are a lot of differences between these two five burner grills the reality is that neither one will last more than two years before they rust out and you take them to the curb for trash. Save your money and get yourself a real grill instead.