I have to say as a counter point though that I've had a lot more trouble with coworkers coming to my physical desk for questions that they could have Googled than with Junior getting stuck for extended period of time remotely. It's all a matter of culture and relationships.
Oh come on... I get arguing that there are ways to make remote training good enough. Maybe even similar. Maybe even a net-positive when you look at the entire picture (including the productivity and happiness of your senior staff). But saying remote is better for training specifically? No way. That makes no logical sense.
In person: Usually have to face the person or the screen, can't see both. I have to write down commands and pass them, or type them myself. There is a delay finding others if we need to talk to them. More chance to transpose commands incorrectly by the user. Harder to record the session without losing parts.
So at minimum, in person would be the same. So I can't possibly see how in person could be worse.
In person is worse. I've done both. It's noisier, you're crammed into a cube taking notes, etc. If you're going to use remote tools, what's the benefit of in person?
Got it, I see you're in the "make up stuff about the other person" phase of the discussion. No point in continuing here.