To me it's not a question of "superior." Radio requires a different kind of announcer - one who can paint a picture with words, because there's no picture without that. It requires a diligence - describing everything that happens - that the TV crew doesn't need.
Harry was good at this - but also an excellent TV PbP guy, where he'd say a bit less, let Richie tell more stories, etc. Harry could change those gears seamlessly. Not all PbP guys really can.
Even with Scottie and LA, there are times (lately, with out-of-hand games in and out-of-hand season), there are times I find myself snarling at the radio, "What about the pitch?! What was it?!" when they're involved in some some back-and-forth banter. I can't fault them - some of these games get long, and when you're getting drubbed... But still, they tend to report every pitch, every pickoff attempt, every step out by the batter, etc. They do a good job, and keep even the really bad games entertaining.