Imo they're better. Portal was more groundbreaking because of when the first one came out, what valve was doing at the time, because everybody played it, and because of its connection with other games at the time.

But now, it's just a very good game that (re)introduced portals as a concept into pop culture and repopulatized and proved that AAA puzzle games were possible.

Talos, on the other hand, is a philosophical indie sleeper, and more of a social experiment. I don't like comparing it to portal, because most people see portal as an insurmountable peak with an impenetrable meme forcefield. And yeah, portal is great. But the Talos games are something very different and stands all on its own.