Hookless rims are the only reason I would even consider something other than GP5000 TL's. They are hands down the best road tires I've ever used. I prefer the 32mm size and find it to be just as fast as the 28mm version, but with a bit more cushion.

I have had zero flats since switching to tubeless over a year ago. If your rims are tubeless compatible, it seems like a no brainer to buy tubeless tires and ditch the tubes. The only downside is a bit of a learning curve on installing.