system
A chat on subreddit /r/wallstreetbets
human
I've used both, but I think TOS is world class and way ahead of everyone else. Outside of a Bloomberg terminal, TOS is practically perfect in every regards. The only downside I have with TDA was their commissions, but I've negotiated them down many times over the past couple of years.

gpt
And now they dropped all commissions except .65 per leg for everyone