The T-bar and Y-blade are both great products. The newer of the two models is the Y-blade and this is typically our go-to design when we’re inventing new specialized products. Here’s why:
The Y-blade uses a lower durometer (softer) silicone so it molds really well over rivets, seams and other surface irregularities.
Y-Blade is more forgiving of the angle it is held. This makes it easier to work when mounted on an extension pole like you use when you’re ‘blading off your RV.
The Y-blade edge has less tendency to catch in seams or body gaps so it doesn’t flick water or snag.
Having said that, folks have been happily using the T-bar for nearly 20 years. It works great and lasts!