system
A chat on subreddit /r/wallstreetbets
human
Great executions, cheap trades, terrible software..  Their interface regularly breaks, bugs out, crashes.   Their API is incredibly difficult to code against...  But, its cheap - and they pay a decent amount of interest for cash and margin lending is also pretty cheap..

gpt
IB is bad but 100% worth it for the margin rates if you use it. Trades arent particularly cheap if you are doing cheap options or penny shit