What is the difference between such YouTube channels (more details in the description)?

Question

YouTube

What is the difference between a channel (method one, conditionally "ABC"), which is created with a Google account , and a channel (method two, conditionally "DEF"), which is created when a Google account already exists?
I noticed these differences:
1. Different default avatars: method two , method one
2. Based on point 1, I think that the channel where the avatar is a man is a personal channel; and the second channel is already a channel, so to speak, for a hobby (excuse me if I said garbage)
3. The ABC channel has a name in the form: last name, first name. The DEF channel is in the form of an alias
4. Also, the ABC channel is, as it were, the parent of the DEF channel, which results in the dependence of DEF on ABC (in my opinion)
Actually, are there any other differences? Not just external, but, they say, important.
Thanks in advance for your replies.
PS Sorry for the absurdity of my question

Answer 1

As an option - one was created from a Google + account, and the second was created together with Google +
Technically the same thing, there are no restrictions and benefits